Editing Yu-Gi-Oh! Duel Monsters (video game)

{{Infobox video game
| image           = YugiohDuelMonstersGB.jpg
| ja_name         = {{Ruby|遊|ユウ}}{{Ruby|戯|ギ}}{{Ruby|王|オウ}}デュエルモンスターズ
| romaji_name     = Yugiō Dyueru Monsutāzu
| platform        = [[wikipedia:Game Boy|Game Boy]]
| languages       = Japanese
| developer       = [[Konami]]
| publisher       = Konami
| ja_release_date = December 16, 1998<ref name="konami dm1 page">https://web.archive.org/web/20180826214725/http://www.konami.jp/products/yugioh_dm1_gb//</ref>
| series          = Yu-Gi-Oh! Duel Monsters (video game series)
| next            = Yu-Gi-Oh! Duel Monsters II: Dark duel Stories
| guide_book_1    = Yu-Gi-Oh! Duel Monsters Perfect Master BOOK
| guide_book_2    = Yu-Gi-Oh! Duel Monsters Perfect Master BOOK Volume 2
}}
'''''Yu-Gi-Oh! Duel Monsters''''' is the second ''Yu-Gi-Oh!'' video game, following ''[[Yu-Gi-Oh! Monster Capsule: Breed and Battle]]''. It is the first game in the [[Yu-Gi-Oh! Duel Monsters (video game series)|''Duel Monsters'' series]], followed by ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories]]'', and the only game released for the [[wikipedia:Game Boy|Game Boy]]. 

This game predates the ''[[OCG]]'' by two months, and many cards seen here soon made appearances in the earliest ''OCG'' sets. It was published in Japan by [[Konami]] on December 16, [[1998]];<ref name="konami dm1 page" /> while a few (non-''Yu-Gi-Oh!''-related) games would be released for the handheld over the next four years, ''Duel Monsters'' was one of the last games [[wikipedia:List of Game Boy games|published for the original Game Boy]].

==Cards==
{{Main|List of ''Yu-Gi-Oh! Duel Monsters'' cards|Gallery of ''Yu-Gi-Oh! Duel Monsters'' cards}}
[[File:Takahashi's DM1 sketches.png|thumb|right|300px|Thirteen of the secret cards, which Takahashi designed for the game (the missing secret cards are #356: "[[Super War-lion (DM1)|Super War-lion]]" and #357: "[[Yamadron (DM1)|Yamadron]]")]]
''Duel Monsters'' features 365 cards. These consist of:

* 300 [[Monster Card|monsters]] and 50 [[Spell Card|Magic Cards]] accessible during normal gameplay:
** 100 monsters and 12 Magic Cards from the [[Yu-Gi-Oh! (manga)|''Yu-Gi-Oh!'' manga]].
*** The majority of these cards appear in chapters up to and including Duel 91: {{chapter|Yu-Gi-Oh!|91}}, released July 27, 1998.
*** Card #217: "[[B. Skull Dragon (DM1)|B. Skull Dragon]]" appears later in Duel 96: {{chapter|Yu-Gi-Oh!|96}}, released September 7, 1998. Unlike the other manga monsters, its card number is not within the first 100.
*** Card #067: "[[Perfectly Ultimate (DM1)|Perfectly Ultimate]]" is mentioned but not seen in the manga. It makes its first visual appearance in this game.
** Card #013: "[[Tyhone (DM1)|Tyhone]]", which previously appeared in ''[[Yu-Gi-Oh! Monster Capsule: Breed and Battle]]''
** 199 monsters and 38 Magic Cards, original to the game
*** At least 9 of these monsters were [[#Card-design contest|designed by fans]].
* 15 secret monsters, at least 13 of which were designed by [[Kazuki Takahashi]].<!-- "Super War-lion" and "Yamadron" are the uncounted. --> These can only be obtained through a [[#Passwords|secret password menu]] or as [[#Prizes|prizes]] at the [[Yu-Gi-Oh! Duel Monsters National Tournament|national tournament]].
** One of the 15, #364: "[[Black Luster Soldi (DM1)|Black Luster Soldi]]" appeared in the manga in Duel 117: {{chapter|Yu-Gi-Oh!|117}}, released February 15, 1999, roughly coinciding with the date it was made publicly available in the game, February 21, 1999.

{{-}}

==Game options==
[[File:YugiohDuelMonstersGB-2.png|thumb|right|The title screen and main menu]]
The following options are available at the main menu:
* '''[[#Campaign|Campaign]]''' (キャンペーン ''Kyanpēn''): the game's story mode. Face AI opponents.
* '''[[#Versus|Versus]]''' (たいせん ''Taisen''): battle other players, using the [[wikipedia:Game Link Cable|Game Link Cable]].
* '''[[#Trade|Trade]]''' (トレード ''Torēdo''): trade with other players via the Game Link Cable.
* '''[[#Records|Records]]''' (せいせき ''Seiseki''): statistics and other information about the player.

There is also a [[#Passwords|password menu]], which is only accessible by entering a secret code at the main menu.

===Campaign===
''Duel Monsters'' is set during the [[Duelist Kingdom (manga arc)|Duelist Kingdom arc]] of the manga.
* The first stage is "'''In the Ship'''" ({{Ruby|船|ふね}}の{{Ruby|中|なか}} ''Fune no Naka'').<ref name="guidebook1 p25">{{cite book|date=December 21, 1998|title=[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK]]|publisher=[[Shueisha]]|page=25|isbn=4-08-779009-6|language=Japanese}}</ref> It takes place on the [[Duelist Kingdom ship]].
* The second stage is "'''Duel Kingdom'''" (デュエル{{Ruby|王国|キングダム}} ''Dyueru Kingudamu'').<ref name="guidebook1 p25" /> It is set on the [[Duelist Kingdom (island)|Duelist Kingdom island]].
* The third stage is "'''Simon Muran'''" (シモン・ムーラン ''Shimon Mūran''), a stage unrelated to the manga arc, featuring a character who debuts in this game.
* The final boss stage is "'''Maximillion Pegasus'''", known as "'''Pegasus J. Crawford'''" (ペガサス・{{Ruby|Ｊ|ジェー}}・クロフォード ''Pegasasu Jē Kurofōdo'') in Japan.
* The dark stage is "'''Yami Yugi'''", known as "'''Dark Yugi'''" ({{Ruby|闇|やみ}}{{Ruby|遊|ゆう}}{{Ruby|戯|ぎ}} ''Yami Yūgi'') in Japan.

The player must defeat each character in a stage five times to advance to the next stage. A character that has been defeated five times can be Dueled additional times for more cards. Defeating [[Maximillion Pegasus (Duel Monsters 1)|Maximillion Pegasus]] five times causes the ending credits to roll. After that an additional Dark Stage appears, with [[Yami Yugi (Duel Monsters 1)|Yami Yugi]] as an opponent.

A total of sixteen opponents are featured in ''Duel Monsters'': four in Stage 1, nine in Stage 2, and one each in the last three stages.

{| class="wikitable"
|-
! scope="col" | Stage
! scope="col" | Opponents
|- style="vertical-align: top;"
! scope="row" | 
<gallery widths="160" heights="144" mode="nolines">
DM ST1.png | Stage 1: "In the Ship"
</gallery>
| 
<gallery widths="160" heights="144" mode="nolines">
Yugi Muto-G1.png    | [[Yugi Muto (Duel Monsters 1)|Yugi Muto]]
Hiroto Honda-G1.png | [[Tristan Taylor (Duel Monsters 1)|Tristan Taylor]]
DM jonouchi.png     | [[Joey Wheeler (Duel Monsters 1)|Joey Wheeler]]
Ryou Bakura-G1.png  | [[Ryou Bakura (Duel Monsters 1)|Ryou Bakura]]
</gallery>
|- style="vertical-align: top;"
! scope="row" | 
<gallery widths="160" heights="144" mode="nolines">
DM ST2.png | Stage 2: "Duel Kingdom"
</gallery>
| 
<gallery widths="160" heights="144" mode="nolines">
Weevil Underwood-DM1.png | [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]]
Mai Valentine-DM1.png    | [[Mai Valentine (Duel Monsters 1)|Mai Valentine]]
Rex Raptor-DM1.png       | [[Rex Raptor (Duel Monsters 1)|Rex Raptor]]
Mako Tsunami-DM1.png     | [[Mako Tsunami (Duel Monsters 1)|Mako Tsunami]]
Seto Kaiba-DM1.png       | [[Seto Kaiba (Duel Monsters 1)|Seto Kaiba]]
Mokuba Kaiba-DM1.png     | [[Mokuba Kaiba (Duel Monsters 1)|Mokuba Kaiba]]
Puppeteer-DM1.png        | [[Puppeteer of Doom (Duel Monsters 1)|Puppeteer of Doom]]
PaniK-DM1.png            | [[PaniK (Duel Monsters 1)|PaniK]]
Bandit Keith-DM1.png     | [[Bandit Keith (Duel Monsters 1)|Bandit Keith]]
</gallery>
|- style="vertical-align: top;"
! scope="row" | 
<gallery widths="160" heights="144" mode="nolines">
DM ST3.png | Stage 3: "Simon Muran"
</gallery>
| 
<gallery widths="160" heights="144" mode="nolines">
DM Siamun.png | [[Simon Muran (Duel Monsters 1)|Simon Muran]]
</gallery>
|- style="vertical-align: top;"
! scope="row" | 
<gallery widths="160" heights="144" mode="nolines">
DM ST4.png | Final Boss: "Maximillion Pegasus"
</gallery>
| 
<gallery widths="160" heights="144" mode="nolines">
DM Pegasus.png | [[Maximillion Pegasus (Duel Monsters 1)|Maximillion Pegasus]]
</gallery>
|- style="vertical-align: top;"
! scope="row" | 
<gallery widths="160" heights="144" mode="nolines">
DM ST5.png | Dark Stage: Yami Yugi
</gallery>
| 
<gallery widths="160" heights="144" mode="nolines">
DM yami yugi.png | [[Yami Yugi (Duel Monsters 1)|Yami Yugi]]
</gallery>
|}

===Versus===
Players can battle other players, who have the same game, using the [[wikipedia:Game Link Cable|Game Link Cable]] via the Versus menu. The Deck can be altered before the battle, from this screen.

After a battle, the winner can [[#Ante|take one card from the opponent's trunk]]. After every ten battles, the player is [[#Communication bonuses|awarded a certain card]].

If this option is selected without a second game being connected, [[Tea Gardner (Duel Monsters 1)|Tea Gardner]] appears and prevents the action.

===Trade===
Players can trade cards with other people who have a copy of the game, via the Game Link Cable.

From the trade screen, the player has three options, "chest", "check card" and "exchange card". The player must open the "chest" menu and select which cards they wish to trade. They can review the cards they have selected in the "check card" screen. The cards are traded when both players select "exchange card".

[[Communication Fusion]]s can be conducted by trading certain cards.

If this option is selected without a second game being connected, Tea Gardner prevents the action.

===Records===
The records screen shows the player's name and communication battle statistics.

==Obtaining cards==
=== Initial Deck ===
{{Main|Initial Deck (''Duel Monsters 1'')}}

The player starts the game with a 40-card [[Initial Deck]] which includes 33 Monster Cards, selected randomly from a pool of 100 monsters, as well as seven Magic Cards, which are always the same.<ref>https://datacrystal.tcrf.net/wiki/Yu-Gi-Oh!_Duel_Monsters:ROM_map#Starter_Deck_-_Random_card_pool</ref>

All cards in the Initial Deck are also available as drops, except for #337: "[[Raigeki (DM1)|Raigeki]]", which can only be obtained as a [[#Victory bonuses|victory bonus]]. In addition to being drops, sixteen other cards are also available as victory bonuses, and #289: "[[Change Slime (DM1)|Change Slime]]" is available as a [[#Communication bonuses|communication bonus]] (but not as a victory bonus). Victory bonus cards are indicated in the following tables with a pink background and a dagger (†) after the card's name, except for #337: "Raigeki", which instead uses a red background and a double dagger (‡).

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|- style="background-color: #fcc;"
| 005 || [[Ryu-kishin (DM1)|Ryu-kishin]]<sup>†</sup>
|-
| 008 || [[Mushroom Man (DM1)|Mushroom Man]]
|-
| 009 || [[Shadow Specter (DM1)|Shadow Specter]]
|-
| 024 || [[Skull Servant (DM1)|Skull Servant]]
|-
| 029 || [[Mountain Warrior (DM1)|Mountain Warrior]]
|- style="background-color: #fcc;"
| 045 || [[Oscillo Hero 2 (DM1)|Oscillo Hero #2]]<sup>†</sup>
|-
| 048 || [[Sangan (DM1)|Sangan]]
|-
| 058 || [[Kuriboh (DM1)|Kuriboh]]
|- style="background-color: #fcc;"
| 075 || [[Man-eating Plant (DM1)|Man-eating Plant]]<sup>†</sup>
|-
| 101 || [[Wings of Wicked Fl (DM1)|Wings of Wicked Fl]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|- style="background-color: #fcc;"
| 102 || [[Mask of Darkness (DM1)|Mask of Darkness]]<sup>†</sup>
|-
| 105 || [[Tomozaurus (DM1)|Tomozaurus]]
|-
| 107 || [[Kageningen (DM1)|Kageningen]]
|-
| 123 || [[Dark Plant (DM1)|Dark Plant]]
|-
| 129 || [[Nemuriko (DM1)|Nemuriko]]
|-
| 130 || [[Weather Control (DM1)|Weather Control]]
|-
| 134 || [[Mystical Capture C (DM1)|Mystical Capture C]]
|-
| 139 || [[B.eye Silv. Zombie (DM1)|B.eye Silv. Zombie]]
|-
| 140 || [[Toad Master (DM1)|Toad Master]]
|-
| 142 || [[Flame Manipulator (DM1)|Flame Manipulator]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 143 || [[Chronolord (DM1)|Chronolord]]
|-
| 144 || [[Wind Djinn (DM1)|Wind Djinn]]
|- style="background-color: #fcc;"
| 145 || [[Phantom Thief (DM1)|Phantom Thief]]<sup>†</sup>
|-
| 147 || [[Monster Egg (DM1)|Monster Egg]]
|-
| 148 || [[Sinister Shadow (DM1)|Sinister Shadow]]
|-
| 152 || [[The Melting Red Sh (DM1)|The Melting Red Sh]]
|-
| 154 || [[Fire Reaper (DM1)|Fire Reaper]]
|- style="background-color: #fcc;"
| 155 || [[Larvas (DM1)|Larvas]]<sup>†</sup>
|-
| 157 || [[Firegrass (DM1)|Firegrass]]
|-
| 158 || [[Man Eater (DM1)|Man Eater]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 159 || [[Dig Beak (DM1)|Dig Beak]]
|-
| 160 || [[M-warrior 1 (DM1)|M-warrior #1]]
|- style="background-color: #fcc;"
| 161 || [[M-warrior 2 (DM1)|M-warrior #2]]<sup>†</sup>
|-
| 167 || [[Ancient Jar (DM1)|Ancient Jar]]
|-
| 173 || [[Dark Prisoner (DM1)|Dark Prisoner]]
|- style="background-color: #fcc;"
| 174 || [[Hurricail (DM1)|Hurricail]]<sup>†</sup>
|-
| 176 || [[Fire Eye (DM1)|Fire Eye]]
|-
| 177 || [[Monsturtle (DM1)|Monsturtle]]
|-
| 179 || [[Phantom Dewan (DM1)|Phantom Dewan]]
|- style="background-color: #fcc;"
| 180 || [[Arlownay (DM1)|Arlownay]]<sup>†</sup>
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 181 || [[Dark Shade (DM1)|Dark Shade]]
|-
| 182 || [[Masked Clown (DM1)|Masked Clown]]
|-
| 183 || [[Lucky Trinket (DM1)|Lucky Trinket]]
|-
| 184 || [[Genin (DM1)|Genin]]
|-
| 185 || [[Eyearmor (DM1)|Eyearmor]]
|-
| 187 || [[Gate Deeg (DM1)|Gate Deeg]]
|-
| 188 || [[Synchar (DM1)|Synchar]]
|-
| 189 || [[Fusionist (DM1)|Fusionist]]
|-
| 190 || [[Akakieisu (DM1)|Akakieisu]]
|-
| 191 || [[LaLa Li-oon (DM1)|LaLa Li-oon]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 192 || [[Key Mace (DM1)|Key Mace]]
|-
| 193 || [[Turtle Tiger (DM1)|Turtle Tiger]]
|-
| 194 || [[Terra the Terrible (DM1)|Terra the Terrible]]
|-
| 195 || [[Doron (DM1)|Doron]]
|-
| 196 || [[Arma Knight (DM1)|Arma Knight]]
|-
| 197 || [[Mech Mole Zombie (DM1)|Mech Mole Zombie]]
|-
| 198 || [[Happy Lover (DM1)|Happy Lover]]
|- style="background-color: #fcc;"
| 199 || [[Penguin Knight (DM1)|Penguin Knight]]<sup>†</sup>
|-
| 200 || [[Petit Dragon (DM1)|Petit Dragon]]
|-
| 202 || [[Air Marmot of Nefa (DM1)|Air Marmot of Nefa]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 203 || [[Phantom Ghost (DM1)|Phantom Ghost]]
|-
| 205 || [[Dorover (DM1)|Dorover]]
|-
| 206 || [[Twin Long Rods 1 (DM1)|Twin Long Rods#1]]
|-
| 207 || [[Droll Bird (DM1)|Droll Bird]]
|-
| 208 || [[Petit Angel (DM1)|Petit Angel]]
|-
| 209 || [[Winged Cleaver (DM1)|Winged Cleaver]]
|-
| 210 || [[Hinotama Soul (DM1)|Hinotama Soul]]
|-
| 211 || [[Kaminarikozou (DM1)|Kaminarikozou]]
|-
| 212 || [[Meotoko (DM1)|Meotoko]]
|-
| 214 || [[B. Flame Kagemusha (DM1)|B. Flame Kagemusha]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 215 || [[Flame Ghost (DM1)|Flame Ghost]]
|-
| 218 || [[Two-mouth Darkrule (DM1)|Two-mouth Darkrule]]
|-
| 222 || [[Midnight Fiend (DM1)|Midnight Fiend]]
|-
| 226 || [[Skull Stalker (DM1)|Skull Stalker]]
|-
| 227 || [[Hitodenchak (DM1)|Hitodenchak]]
|-
| 228 || [[Wood Remains (DM1)|Wood Remains]]
|-
| 229 || [[Hourglass of Life (DM1)|Hourglass of Life]]
|-
| 232 || [[Madjinn Gunn (DM1)|Madjinn Gunn]]
|-
| 237 || [[Haniwa (DM1)|Haniwa]]
|- style="background-color: #fcc;"
| 238 || [[Yashinoki (DM1)|Yashinoki]]<sup>†</sup>
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 239 || [[Vishwar Randi (DM1)|Vishwar Randi]]
|-
| 240 || [[The Drdek (DM1)|The Drdek]]
|-
| 242 || [[Candle of Destiny (DM1)|Candle of Destiny]]
|-
| 243 || [[Water Element (DM1)|Water Element]]
|-
| 244 || [[Dissolverock (DM1)|Dissolverock]]
|-
| 245 || [[Meda Bat (DM1)|Meda Bat]]
|-
| 247 || [[Root Water (DM1)|Root Water]]
|-
| 253 || [[Angelwitch (DM1)|Angelwitch]]
|-
| 254 || [[Embryonic Beast (DM1)|Embryonic Beast]]
|-
| 261 || [[Wicked Mirror (DM1)|Wicked Mirror]]
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Monsters
|-
! scope="col" | #
! scope="col" | Card
|-
| 268 || [[Sectarian of Secre (DM1)|Sectarian of Secre]]
|-
| 271 || [[Megirus Light (DM1)|Megirus Light]]
|- style="background-color: #fcc;"
| 276 || [[Ray & Temperature (DM1)|Ray & Temperature]]<sup>†</sup>
|-
| 279 || [[King Fog (DM1)|King Fog]]
|-
| 282 || [[Mystical Sheep 2 (DM1)|Mystical Sheep #2]]
|-
| 285 || [[Serpent Marauder (DM1)|Serpent Marauder]]
|-
| 289 || [[Change Slime (DM1)|Change Slime]]
|-
| 292 || [[Psychic Kappa (DM1)|Psychic Kappa]]
|-
| 298 || [[Wicked Dragon with (DM1)|Wicked Dragon with]]
|- style="background-color: #fcc;"
| 300 || [[Kurama (DM1)|Kurama]]<sup>†</sup>
|-
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ Magic Cards
|-
! scope="col" | #
! scope="col" | Card
|- style="background-color: #f88;"
| 337 || [[Raigeki (DM1)|Raigeki]]<sup>‡</sup>
|- style="background-color: #fcc;"
| 338 || [[Mooyan Curry (DM1)|Mooyan Curry]]<sup>†</sup>
|- style="background-color: #fcc;"
| 339 || [[Red Medicine (DM1)|Red Medicine]]<sup>†</sup>
|-
| 343 || [[Sparks (DM1)|Sparks]] ×2
|-
| 344 || [[Hinotama (DM1)|Hinotama]]
|- style="background-color: #fcc;"
| 350 || [[Dark-piercing Ligh (DM1)|Dark-piercing Ligh]]<sup>†</sup>
|-
|}

===Opponent drops===
When an opponent is defeated, the player is given a card.

Each opponent has a different list of cards the player can get for beating them, with each card on the list having an assigned probability of randomly obtaining it. See [[Yugi Muto (Duel Monsters 1)#Drops|Yugi Muto (''Duel Monsters 1'') § Drops]] for example.

===Victory bonuses===
The player wins a certain card from each opponent after every ten wins against that opponent, up to 100 wins.

Eighteen cards in the game are only available as victory bonuses; these are indicated in the below tables with a pink background and a superscript dagger (†) after the card's name. Specifically, the 100 victory bonus of every character is only available as a victory bonus, except for [[Mako Tsunami (Duel Monsters 1)|Mako Tsunami]]'s 100 victory bonus, #337: "[[Raigeki (DM1)|Raigeki]]", which the player's [[#Initial Deck|Initial Deck]] contains one copy of.

Fourteen victory bonuses are also available as [[#Communication bonuses|communication bonuses]], indicated with a yellow background and a superscript double dagger (‡). Sixteen victory bonuses are also available in the [[#Initial Deck|Initial Deck]] (though none of them are also communication bonuses), indicated with a green background and a superscript section sign (§). All of these, except for #337: "Raigeki", are also available as drops, as are all of the other victory bonuses which are otherwise available.

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Yugi Muto (Duel Monsters 1)|Yugi Muto]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 314 || [[Horn of the Unicor (DM1)|Horn of the Unicor]]
|- style="background-color: #cfc; color: #222;"
| 20  || 350 || [[Dark-piercing Ligh (DM1)|Dark-piercing Ligh]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 30  || 199 || [[Penguin Knight (DM1)|Penguin Knight]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 40  || 161 || [[M-warrior 2 (DM1)|M-warrior #2]]<sup>§</sup>
|-
| 50  || 114 || [[White Magical Hat (DM1)|White Magical Hat]]
|-
| 60  || 270 || [[Wetha (DM1)|Wetha]]
|-
| 70  || 118 || [[Supporter in the S (DM1)|Supporter in the S]]
|- style="background-color: #cfc; color: #222;"
| 80  || 276 || [[Ray & Temperature (DM1)|Ray & Temperature]]<sup>§</sup>
|- style="background-color: #fcc; color: #222;"
| 90  || 039 || [[Curse of Dragon (DM1)|Curse of Dragon]]<sup>†</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 038 || [[Gaia The Fierce Kn (DM1)|Gaia The Fierce Kn]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Tristan Taylor (Duel Monsters 1)|Tristan Taylor]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 310 || [[Vile Germs (DM1)|Vile Germs]]
|-
| 20  || 312 || [[Silver Bow & Arrow (DM1)|Silver Bow & Arrow]]
|- style="background-color: #cfc; color: #222;"
| 30  || 238 || [[Yashinoki (DM1)|Yashinoki]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 40  || 300 || [[Kurama (DM1)|Kurama]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 50  || 155 || [[Larvas (DM1)|Larvas]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 60  || 180 || [[Arlownay (DM1)|Arlownay]]<sup>§</sup>
|-
| 70  || 257 || [[Stone Armadiller (DM1)|Stone Armadiller]]
|- style="background-color: #cfc; color: #222;"
| 80  || 174 || [[Hurricail (DM1)|Hurricail]]<sup>§</sup>
|-
| 90  || 252 || [[Nekogal 1 (DM1)|Nekogal #1]]
|- style="background-color: #fcc; color: #222;"
| 100 || 018 || [[L Leg of Forbidden (DM1)|L Leg of Forbidden]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Joey Wheeler (Duel Monsters 1)|Joey Wheeler]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 333 || [[Sogen (DM1)|Sogen]]
|-
| 20  || 301 || [[Legendary Sword (DM1)|Legendary Sword]]
|-
| 30  || 064 || [[Tiger Axe (DM1)|Tiger Axe]]
|-
| 40  || 043 || [[Karbonala Warrior (DM1)|Karbonala Warrior]]
|-
| 50  || 078 || [[Axe Raider (DM1)|Axe Raider]]
|-
| 60  || 014 || [[Battle Steer (DM1)|Battle Steer]]
|-
| 70  || 012 || [[Swamp Battleguard (DM1)|Swamp Battleguard]]
|-
| 80  || 068 || [[Garoozis (DM1)|Garoozis]]
|- style="background-color: #ffc; color: #222;"
| 90  || 016 || [[Time Wizard (DM1)|Time Wizard]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 082 || [[Red-eyes B. Dragon (DM1)|Red-eyes B. Dragon]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Ryou Bakura (Duel Monsters 1)|Ryou Bakura]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 335 || [[Yami (DM1)|Yami]]
|-
| 20  || 236 || [[Guardian of the La (DM1)|Guardian of the La]]
|- style="background-color: #cfc; color: #222;"
| 30  || 338 || [[Mooyan Curry (DM1)|Mooyan Curry]]<sup>§</sup>
|-
| 40  || 294 || [[Dragoness the Wick (DM1)|Dragoness the Wick]]
|- style="background-color: #cfc; color: #222;"
| 50  || 339 || [[Red Medicine (DM1)|Red Medicine]]<sup>§</sup>
|-
| 60  || 259 || [[Dimensional Knight (DM1)|Dimensional Knight]]
|- style="background-color: #ffc; color: #222;"
| 70  || 340 || [[Goblin's Secret Re (DM1)|Goblin's Secret Re]]<sup>‡</sup>
|-
| 80  || 225 || [[Fiend Sword (DM1)|Fiend Sword]]
|- style="background-color: #fcc; color: #222;"
| 90  || 341 || [[Soul of the Pure (DM1)|Soul of the Pure]]<sup>†</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 342 || [[Dian Keto the Cure (DM1)|Dian Keto the Cure]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 330 || [[Forest (DM1)|Forest]]
|-
| 20  || 050 || [[Basic Insect (DM1)|Basic Insect]]
|-
| 30  || 305 || [[Lazer Cannon Armor (DM1)|Lazer Cannon Armor]]
|-
| 40  || 053 || [[Killer Needle (DM1)|Killer Needle]]
|-
| 50  || 306 || [[Insect Armor with (DM1)|Insect Armor with]]
|-
| 60  || 054 || [[Gokibore (DM1)|Gokibore]]
|-
| 70  || 049 || [[Big Insect (DM1)|Big Insect]]
|-
| 80  || 055 || [[Giant Flea (DM1)|Giant Flea]]
|- style="background-color: #ffc; color: #222;"
| 90  || 052 || [[Hercules Beetle (DM1)|Hercules Beetle]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 278 || [[Petit Moth (DM1)|Petit Moth]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Mai Valentine (Duel Monsters 1)|Mai Valentine]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 332 || [[Mountain (DM1)|Mountain]]
|-
| 20  || 327 || [[Follow Wind (DM1)|Follow Wind]]
|-
| 30  || 062 || [[Harpie Lady (DM1)|Harpie Lady]]
|-
| 40  || 318 || [[Elegant Egotist (DM1)|Elegant Egotist]]
|-
| 50  || 272 || [[Mavelus (DM1)|Mavelus]]
|- style="background-color: #ffc; color: #222;"
| 60  || 316 || [[Electro-whip (DM1)|Electro-whip]]<sup>‡</sup>
|-
| 70  || 117 || [[Spirit of the Book (DM1)|Spirit of the Book]]
|-
| 80  || 125 || [[Faith Bird (DM1)|Faith Bird]]
|- style="background-color: #ffc; color: #222;"
| 90  || 317 || [[Cyber Shield (DM1)|Cyber Shield]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 063 || [[Harpie Lady Sister (DM1)|Harpie Lady Sister]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Rex Raptor (Duel Monsters 1)|Rex Raptor]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 331 || [[Wasteland (DM1)|Wasteland]]
|-
| 20  || 326 || [[Raise Body Heat (DM1)|Raise Body Heat]]
|-
| 30  || 080 || [[Uraby (DM1)|Uraby]]
|-
| 40  || 081 || [[Crawling Dragon 2 (DM1)|Crawling Dragon #2]]
|- style="background-color: #ffc; color: #222;"
| 50  || 011 || [[Sword Arm of Drago (DM1)|Sword Arm of Drago]]<sup>‡</sup>
|-
| 60  || 080 || [[Uraby (DM1)|Uraby]]
|-
| 70  || 081 || [[Crawling Dragon 2 (DM1)|Crawling Dragon #2]]
|- style="background-color: #ffc; color: #222;"
| 80  || 011 || [[Sword Arm of Drago (DM1)|Sword Arm of Drago]]<sup>‡</sup>
|- style="background-color: #ffc; color: #222;"
| 90  || 079 || [[Megazowler (DM1)|Megazowler]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 032 || [[Two-headed King Re (DM1)|Two-headed King Re]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Mako Tsunami (Duel Monsters 1)|Mako Tsunami]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 334 || [[Umi (DM1)|Umi]]
|-
| 20  || 328 || [[Power of Kaishin (DM1)|Power of Kaishin]]
|-
| 30  || 309 || [[Steel Shell (DM1)|Steel Shell]]
|-
| 40  || 070 || [[Fiend Kraken (DM1)|Fiend Kraken]]
|-
| 50  || 071 || [[Jellyfish (DM1)|Jellyfish]]
|- style="background-color: #ffc; color: #222;"
| 60  || 073 || [[Kairyu-shin (DM1)|Kairyu-shin]]<sup>‡</sup>
|-
| 70  || 070 || [[Fiend Kraken (DM1)|Fiend Kraken]]
|-
| 80  || 071 || [[Jellyfish (DM1)|Jellyfish]]
|- style="background-color: #ffc; color: #222;"
| 90  || 073 || [[Kairyu-shin (DM1)|Kairyu-shin]]<sup>‡</sup>
|- style="background-color: #cfc; color: #222;"
| 100 || 337 || [[Raigeki (DM1)|Raigeki]]<sup>§</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Seto Kaiba (Duel Monsters 1)|Seto Kaiba]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 302 || [[Sword of Ruin (DM1)|Sword of Ruin]]
|-
| 20  || 321 || [[Malevolent Nuzzler (DM1)|Malevolent Nuzzler]]
|- style="background-color: #cfc; color: #222;"
| 30  || 005 || [[Ryu-kishin (DM1)|Ryu-kishin]]<sup>§</sup>
|-
| 40  || 077 || [[Grappler (DM1)|Grappler]]
|-
| 50  || 091 || [[Mystic Horseman (DM1)|Mystic Horseman]]
|-
| 60  || 023 || [[The Wicked Worm B (DM1)|The Wicked Worm B]]
|- style="background-color: #ffc; color: #222;"
| 70  || 026 || [[Battle Ox (DM1)|Battle Ox]]<sup>‡</sup>
|-
| 80  || 033 || [[Judge Man (DM1)|Judge Man]]
|- style="background-color: #ffc; color: #222;"
| 90  || 090 || [[Gyakutenno Megami (DM1)|Gyakutenno Megami]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 001 || [[B.eye White Dragon (DM1)|B.eye White Dragon]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Mokuba Kaiba (Duel Monsters 1)|Mokuba Kaiba]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 336 || [[Dark Hole (DM1)|Dark Hole]]
|-
| 20  || 313 || [[Horn of Light (DM1)|Horn of Light]]
|-
| 30  || 324 || [[Invigoration (DM1)|Invigoration]]
|- style="background-color: #cfc; color: #222;"
| 40  || 075 || [[Man-eating Plant (DM1)|Man-eating Plant]]<sup>§</sup>
|- style="background-color: #cfc; color: #222;"
| 50  || 102 || [[Mask of Darkness (DM1)|Mask of Darkness]]<sup>§</sup>
|-
| 60  || 076 || [[Krokodilus (DM1)|Krokodilus]]
|- style="background-color: #ffc; color: #222;"
| 70  || 051 || [[Armored Lizard (DM1)|Armored Lizard]]<sup>‡</sup>
|- style="background-color: #ffc; color: #222;"
| 80  || 066 || [[Kojikocy (DM1)|Kojikocy]]<sup>‡</sup>
|-
| 90  || 234 || [[Beautiful Headhunt (DM1)|Beautiful Headhunt]]
|- style="background-color: #fcc; color: #222;"
| 100  || 017 || [[R Leg of Forbidden (DM1)|R Leg of Forbidden]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Puppeteer of Doom (Duel Monsters 1)|Puppeteer of Doom]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 320 || [[Stop Defense (DM1)|Stop Defense]]
|-
| 20  || 119 || [[Trial of Nightmare (DM1)|Trial of Nightmare]]
|-
| 30  || 233 || [[Dark Titan of Terr (DM1)|Dark Titan of Terr]]
|-
| 40  || 163 || [[Lisark (DM1)|Lisark]]
|-
| 50  || 165 || [[The Judgement Hand (DM1)|The Judgement Hand]]
|-
| 60  || 297 || [[Cyber Soldier of D (DM1)|Cyber Soldier of D]]
|-
| 70  || 136 || [[Witty Phantom (DM1)|Witty Phantom]]
|-
| 80  || 275 || [[Terra Bugroth (DM1)|Terra Bugroth]]
|-
| 90  || 286 || [[Gatekeeper (DM1)|Gatekeeper]]
|- style="background-color: #fcc; color: #222;"
| 100 || 019 || [[R Arm of Forbidden (DM1)|R Arm of Forbidden]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[PaniK (Duel Monsters 1)|PaniK]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 335 || [[Yami (DM1)|Yami]]
|-
| 20  || 303 || [[Dark Energy (DM1)|Dark Energy]]
|-
| 30  || 083 || [[Castle of D. Magic (DM1)|Castle of D. Magic]]
|-
| 40  || 088 || [[Metal Guardian (DM1)|Metal Guardian]]
|-
| 50  || 086 || [[Barox (DM1)|Barox]]
|-
| 60  || 084 || [[Reaper of the Card (DM1)|Reaper of the Card]]
|-
| 70  || 281 || [[Mystic Clown (DM1)|Mystic Clown]]
|-
| 80  || 087 || [[Dark Chimera (DM1)|Dark Chimera]]
|-
| 90  || 127 || [[Ansatsu (DM1)|Ansatsu]]
|- style="background-color: #fcc; color: #222;"
| 100 || 085 || [[King of Yamimakai (DM1)|King of Yamimakai]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Bandit Keith (Duel Monsters 1)|Bandit Keith]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 325 || [[Machine Conversion (DM1)|Machine Conversion]]
|-
| 20  || 322 || [[Violet Crystal (DM1)|Violet Crystal]]
|-
| 30  || 098 || [[Clown Zombie (DM1)|Clown Zombie]]
|-
| 40  || 036 || [[The Snake Hair (DM1)|The Snake Hair]]
|-
| 50  || 093 || [[Zanki (DM1)|Zanki]]
|-
| 60  || 286 || [[Gatekeeper (DM1)|Gatekeeper]]
|-
| 70  || 094 || [[Crawling Dragon (DM1)|Crawling Dragon]]
|-
| 80  || 124 || [[Ancient Tool (DM1)|Ancient Tool]]
|- style="background-color: #fcc; color: #222;"
| 90  || 099 || [[Pumpking the King (DM1)|Pumpking the King]]<sup>†</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 020 || [[L Arm of Forbidden (DM1)|L Arm of Forbidden]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Simon Muran (Duel Monsters 1)|Simon Muran]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 323 || [[Book of Secret Art (DM1)|Book of Secret Art]]
|-
| 20  || 311 || [[Black Pendant (DM1)|Black Pendant]]
|-
| 30  || 304 || [[Axe of Despair (DM1)|Axe of Despair]]
|-
| 40  || 307 || [[Elf's Light (DM1)|Elf's Light]]
|-
| 50  || 308 || [[Beast Fangs (DM1)|Beast Fangs]]
|-
| 60  || 213 || [[Aqua Madoor (DM1)|Aqua Madoor]]
|- style="background-color: #cfc; color: #222;"
| 70  || 145 || [[Phantom Thief (DM1)|Phantom Thief]]<sup>§</sup>
|-
| 80  || 106 || [[Spirit of the Wind (DM1)|Spirit of the Wind]]
|- style="background-color: #ffc; color: #222;"
| 90  || 022 || [[Summoned Skull (DM1)|Summoned Skull]]<sup>‡</sup>
|- style="background-color: #fcc; color: #222;"
| 100 || 042 || [[Faceless Mage (DM1)|Faceless Mage]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Maximillion Pegasus (Duel Monsters 1)|Maximillion Pegasus]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 284 || [[Tao the Chanter (DM1)|Tao the Chanter]]
|-
| 20  || 241 || [[Dark Assailant (DM1)|Dark Assailant]]
|-
| 30  || 040 || [[Dragon Piper (DM1)|Dragon Piper]]
|-
| 40  || 287 || [[Ogre of the Black (DM1)|Ogre of the Black]]
|- style="background-color: #cfc; color: #222;"
| 50  || 045 || [[Oscillo Hero 2 (DM1)|Oscillo Hero #2]]<sup>§</sup>
|- style="background-color: #ffc; color: #222;"
| 60  || 329 || [[Dragon Capture Jar (DM1)|Dragon Capture Jar]]<sup>‡</sup>
|-
| 70  || 291 || [[Fireyarou (DM1)|Fireyarou]]
|-
| 80  || 149 || [[Lord of the Lamp (DM1)|Lord of the Lamp]]
|-
| 90  || 044 || [[Rogue Doll (DM1)|Rogue Doll]]
|- style="background-color: #fcc; color: #222;"
| 100 || 315 || [[Dragon Treasure (DM1)|Dragon Treasure]]<sup>†</sup>
|}

{| class="wikitable" style="display: inline-table;"
|-
|+ [[Yami Yugi (Duel Monsters 1)|Yami Yugi]]
|-
! scope="col" | Wins
! scope="col" | #
! scope="col" | Card
|-
| 10  || 006 || [[Feral Imp (DM1)|Feral Imp]]
|-
| 20  || 007 || [[Winged Dragon 1 (DM1)|Winged Dragon #1]]
|-
| 30  || 041 || [[Celtic Guardian (DM1)|Celtic Guardian]]
|-
| 40  || 319 || [[Mystical Moon (DM1)|Mystical Moon]]
|-
| 50  || 010 || [[Blackland Fire Dra (DM1)|Blackland Fire Dra]]
|-
| 60  || 348 || [[Swords of Revealin (DM1)|Swords of Revealin]]
|-
| 70  || 031 || [[Koumori Dragon (DM1)|Koumori Dragon]]
|-
| 80  || 060 || [[Great White (DM1)|Great White]]
|-
| 90  || 345 || [[Final Flame (DM1)|Final Flame]]
|- style="background-color: #fcc; color: #222;"
| 100 || 021 || [[Exod. of Forbidden (DM1)|Exod. of Forbidden]]<sup>†</sup>
|}

===Communication bonuses===
The player receives a certain card after every ten battles against different human opponents via the [[wikipedia:Game Link Cable|Game Link Cable]], up to 200 unique opponents. While fifteen of these cards are also available as [[#Opponent drops|drops]] and [[#Victory bonuses|victory bonuses]], five of them can only be obtained as communication bonuses; these are indicated in the below table with a pink background and a superscript dagger (†) after the card's name.

The card #347: "[[Tremendous Fire (DM1)|Tremendous Fire]]" was notoriously powerful in this game, with the ability to instantly inflict 5000 [[Effect damage|damage]]. It is also considered one of the most difficult cards to unlock, requiring to battle 200 different opponents.

Because no official method of erasing a saved game was ever published, players could not easily keep resetting a second copy of the game to face more unique opponents. However, there is a secret method to erase the saved game coded into the game. To achieve this, players can press the following buttons at the title screen: {{nowrap|{{key press|↓}}, {{key press|↑}}, {{key press|B}}, {{key press|↓}}, {{key press|↓}}, {{key press|→}}, {{key press|↑}}, {{key press|↑}}, {{key press|↑}}, {{key press|↑}}, {{key press|B}} + {{key press|↓}}}}. Other non-standard methods of erasing the save file involve directly tampering with the cartridge, which risks damaging it or the console used to play it.

{| class="wikitable"
|-
! scope="col" | Opponents
! scope="col" | #
! scope="col" | Card
|-
| 10  || 289 || [[Change Slime (DM1)|Change Slime]]
|- style="background-color: #fcc;"
| 20  || 015 || [[Flame Swordsman (DM1)|Flame Swordsman]]<sup>†</sup>
|-
| 30  || 026 || [[Battle Ox (DM1)|Battle Ox]]
|-
| 40  || 329 || [[Dragon Capture Jar (DM1)|Dragon Capture Jar]]
|- style="background-color: #fcc;"
| 50  || 004 || [[Baby Dragon (DM1)|Baby Dragon]]<sup>†</sup>
|-
| 60  || 051 || [[Armored Lizard (DM1)|Armored Lizard]]
|-
| 70  || 340 || [[Goblin's Secret Re (DM1)|Goblin's Secret Re]]
|-
| 80  || 316 || [[Electro-whip (DM1)|Electro-whip]]
|-
| 90  || 011 || [[Sword Arm of Drago (DM1)|Sword Arm of Drago]]
|- style="background-color: #fcc;"
| 100 || 349 || [[Spellbinding Circl (DM1)|Spellbinding Circl]]<sup>†</sup>
|-
| 110 || 016 || [[Time Wizard (DM1)|Time Wizard]]
|-
| 120 || 090 || [[Gyakutenno Megami (DM1)|Gyakutenno Megami]]
|-
| 130 || 066 || [[Kojikocy (DM1)|Kojikocy]]
|-
| 140 || 052 || [[Hercules Beetle (DM1)|Hercules Beetle]]
|- style="background-color: #fcc;"
| 150 || 346 || [[Ookazi (DM1)|Ookazi]]<sup>†</sup>
|-
| 160 || 317 || [[Cyber Shield (DM1)|Cyber Shield]]
|-
| 170 || 079 || [[Megazowler (DM1)|Megazowler]]
|-
| 180 || 073 || [[Kairyu-shin (DM1)|Kairyu-shin]]
|-
| 190 || 022 || [[Summoned Skull (DM1)|Summoned Skull]]
|- style="background-color: #fcc;"
| 200 || 347 || [[Tremendous Fire (DM1)|Tremendous Fire]]<sup>†</sup>
|}

===Trading===
Cards can be traded from other games using the [[wikipedia:Game Link Cable|Game Link Cable]].

''Duel Monsters'' can connect with other copies of ''Duel Monsters''. ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories|Duel Monsters II: Dark duel Stories]]'', ''Duel Monsters III: Tri-Holy God Advent'' (the Japanese edition of ''[[Yu-Gi-Oh! Dark Duel Stories|Dark Duel Stories]]''), and ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist|Duel Monsters 4: Battle of Great Duelist]]'' can connect to copies of ''Duel Monsters''.

===Communication Fusion===
[[Communication Fusion]]s can be performed by connecting to a second copy of ''Duel Monsters'' or to a copy of ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories|Duel Monsters II: Dark duel Stories]]'', using the [[wikipedia:Game Link Cable|Game Link Cable]]. This requires the two Fusion Materials and #289: "[[Change Slime (DM1)|Change Slime]]". "Change Slime" has a chance of being included in the [[#Initial Deck|Initial Deck]]; after that, it can only be obtained [[Change Slime (DM1)#Drops|with a chance of 1/2048 per Duel]] against certain opponents, or as the first [[#Communication bonuses|communication bonus]] after battling against ten different opponents over the Game Link Cable.

Eight different cards are available as Communication Fusions, and none of them can be obtained by any other method in-game, though all of them can be traded back from later games.

{{pound}}067 "[[Perfectly Ultimate (DM1)|Perfectly Ultimate]]" requires a total of eight Communication Fusions to obtain, each of which requires a copy of "Change Slime"; it also requires three copies of #278: "[[Petit Moth (DM1)|Petit Moth]]", which is only available as [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]]'s 100 [[#Victory bonuses|victory bonus]]. Because of this, it is considered to be an extremely difficult card to obtain.

{| class="wikitable"
|-
! scope="col" colspan="2" | Fusion Monster
! scope="col" colspan="2" | Material 1
! scope="col" colspan="2" | Material 2
|-
| 037
| [[Gaia the Dragon Ch (DM1)|Gaia the Dragon Ch]]
| 038
| [[Gaia The Fierce Kn (DM1)|Gaia The Fierce Kn]]
| 039
| [[Curse of Dragon (DM1)|Curse of Dragon]]
|-
| 069
| [[Thousand Dragon (DM1)|Thousand Dragon]]
| 004
| [[Baby Dragon (DM1)|Baby Dragon]]
| 016
| [[Time Wizard (DM1)|Time Wizard]]
|-
| 092
| [[Rabid Horseman (DM1)|Rabid Horseman]]
| 026
| [[Battle Ox (DM1)|Battle Ox]]
| 091
| [[Mystic Horseman (DM1)|Mystic Horseman]]
|-
| rowspan="9" | 056
| rowspan="9" | [[Larvae Moth (DM1)|Larvae Moth]]
| rowspan="9" | 278
| rowspan="9" | [[Petit Moth (DM1)|Petit Moth]]
| 123
| [[Dark Plant (DM1)|Dark Plant]]
|-
| 157
| [[Firegrass (DM1)|Firegrass]]
|-
| 274
| [[Green Phantom King (DM1)|Green Phantom King]]
|-
| 273
| [[Ancient Tree of En (DM1)|Ancient Tree of En]]
|-
| 008
| [[Mushroom Man (DM1)|Mushroom Man]]
|-
| 075
| [[Man-eating Plant (DM1)|Man-eating Plant]]
|-
| 158
| [[Man Eater (DM1)|Man Eater]]
|-
| 238
| [[Yashinoki (DM1)|Yashinoki]]
|-
| 180
| [[Arlownay (DM1)|Arlownay]]
|-
| rowspan="9" | 072
| rowspan="9" | [[Cocoon of Evolutio (DM1)|Cocoon of Evolutio]]
| rowspan="9" | 056
| rowspan="9" | [[Larvae Moth (DM1)|Larvae Moth]]
| 123
| [[Dark Plant (DM1)|Dark Plant]]
|-
| 157
| [[Firegrass (DM1)|Firegrass]]
|-
| 274
| [[Green Phantom King (DM1)|Green Phantom King]]
|-
| 273
| [[Ancient Tree of En (DM1)|Ancient Tree of En]]
|-
| 008
| [[Mushroom Man (DM1)|Mushroom Man]]
|-
| 075
| [[Man-eating Plant (DM1)|Man-eating Plant]]
|-
| 158
| [[Man Eater (DM1)|Man Eater]]
|-
| 238
| [[Yashinoki (DM1)|Yashinoki]]
|-
| 180
| [[Arlownay (DM1)|Arlownay]]
|-
| 057
| [[Great Moth (DM1)|Great Moth]]
| 072
| [[Cocoon of Evolutio (DM1)|Cocoon of Evolutio]]
| 072
| [[Cocoon of Evolutio (DM1)|Cocoon of Evolutio]]
|-
| 067
| [[Perfectly Ultimate (DM1)|Perfectly Ultimate]]
| 057
| [[Great Moth (DM1)|Great Moth]]
| 072
| [[Cocoon of Evolutio (DM1)|Cocoon of Evolutio]]
|-
| 217
| [[B. Skull Dragon (DM1)|B. Skull Dragon]]
| 022
| [[Summoned Skull (DM1)|Summoned Skull]]
| 082
| [[Red-eyes B. Dragon (DM1)|Red-eyes B. Dragon]]
|}

===Ante===
After a communication battle, the winner must take one card from their opponent's trunk.

=== Passwords ===
Nine of the fifteen secret cards in ''Duel Monsters'' can be unlocked via [[password]]s. These passwords use [[wikipedia:kana|kana]], rather than numbers or letters. Each password is the name of a staff member who worked on the game, or who worked on the [[Yu-Gi-Oh! (manga)|manga series]] at [[Shueisha]] at the time. Many later video games instead use passwords which consist of eight digits, found on cards released in the ''[[Yu-Gi-Oh! Official Card Game]]'', which did not premiere until after this game was released.

To access the password entry, the following button sequence must be entered on the main menu: {{key press|up}}, {{key press|down}}, {{key press|B}}, {{key press|down}}, {{key press|down}}, {{key press|up|B}}, {{key press|B}}. This requires frame-perfect input to succeed; if the game is being played on an emulator, the password entry can also be accessed by changing RAM address $DFDE to <code>0x06</code> and pressing {{key press|B}}. Alternatively, the [[wikipedia:Game Genie|Game Genie]] code <code>06F-DE2-F7E</code> can be used, which removes the requirement for frame-perfect button entry and reduces the button sequence to {{key press|up}}, {{key press|down}}, {{key press|B}}, {{key press|down}}, {{key press|down}}, {{key press|B}}.

After successfully entering the button sequence, [[Yami Yugi (Duel Monsters 1)|Yami Yugi]] appears and introduces the password mode, and then the player can enter a password. The screens used for password entry are the hiragana and katakana entry screens used to enter the player's name at the start of the game. Once a password is entered, Yami Yugi appears again and tells the player whether the entered password is correct, incorrect, or has already been used, and the game returns to the main menu.

The Passwords and instructions on how to access the Password menu were published in various supplementary material, including:
* [[Top Secret Card]]s
* ''[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK]]'', released December 21, 1998
* The 1999 #2 issue of ''[[V Jump]]'', released December 21, 1998
* The [[Weekly Shonen Jump 1999, issue 9|1999 #9 issue]] of ''[[Weekly Shōnen Jump]]'', released January 25, 1999
* The 1999 #4 issue of ''[[V Jump]]'', released February 21, 1999
* ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories Game Guide 2|Yu-Gi-Oh Duel Monsters II: Dark duel Stories Ultimate Strategy Book Volume 2]]'', released August 5, 1999

{| class="wikitable sortable"
|-
! scope="col" | #
! scope="col" | Card
! scope="col" | Password
! scope="col" | ''Rōmaji''
! scope="col" | Individual
! scope="col" | Sources
|-
| rowspan="3" | 351
| rowspan="3" | [[Yaranzo (DM1)|Yaranzo]]
| rowspan="3" | ヘイシヨシヒサ
| rowspan="3" | ''heishiyoshihisa''
| rowspan="3" | Yoshihisa Heishi, long-time editor for ''Weekly Shōnen Jump''
| data-sort-value="1" | [[Top Secret Card]]
|-
| data-sort-value="5"| ''VJ'' 1999 #4
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| 352
| [[Kanan the Swordmis (DM1)|Kanan the Swordmis]]
| ハシモトカナコ
| ''hashimotokanako''
| Kanako Hashimoto, director of graphics for ''Duel Monsters''
| data-sort-value="1" | Top Secret Card
|-
| rowspan="3" | 353
| rowspan="3" | [[Takriminos (DM1)|Takriminos]]
| rowspan="3" | チダタクリ
| rowspan="3" | ''chidatakuri''
| rowspan="3" | Takuri Chida, programmer for ''Duel Monsters''
| data-sort-value="1" | Top Secret Card
|-
| data-sort-value="5" | ''VJ'' 1999 #4
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| rowspan="3" | 354
| rowspan="3" | [[Stuffed Animal (DM1)|Stuffed Animal]]
| rowspan="3" | キタウエカズミ
| rowspan="3" | ''kitauekazumi''
| rowspan="3" | Kazumi Kitaue, executive producer for ''Duel Monsters''
| data-sort-value="2" | ''[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK|Perfect Master BOOK]]''
|-
| data-sort-value="4" | ''VJ'' 1999 #2
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| 355
| [[Megasonic Eye (DM1)|Megasonic Eye]]
| シモムラサトシ
| ''shimomurasatoshi''
| [[Satoshi Shimomura]], producer for ''Duel Monsters''
| data-sort-value="999" | 
|-
| rowspan="2" | 358
| rowspan="2" | [[Seiyaryu (DM1)|Seiyaryu]]
| rowspan="2" | トリシマカズヒコ
| rowspan="2" | ''torishimakazuhiko''
| rowspan="2" | Kazuhiko Torishima, editor-in-chief for ''Weekly Shōnen Jump''
| data-sort-value="4" | ''VJ'' 1999 #4
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| rowspan="3" | 359
| rowspan="3" | [[Three-legged Zombi (DM1)|Three-legged Zombi]]
| rowspan="3" | タカハシトシマサ
| rowspan="3" | ''takahashitoshimasa''
| rowspan="3" | Toshimasa Takahashi, editor for ''Weekly Shōnen Jump''
| data-sort-value="1" | Top Secret Card
|-
| data-sort-value="5" | ''VJ'' 1999 #2
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| rowspan="3" | 361
| rowspan="3" | [[Flying Penguin (DM1)|Flying Penguin]]
| rowspan="3" | ヤマダノブヒロ
| rowspan="3" | ''yamadanobuhiro''
| rowspan="3" | Nobuhiro Yamada, director of game design for ''Duel Monsters''
| data-sort-value="3" | ''WSJ'' 1999 #9
|-
| data-sort-value="4" | ''VJ'' 1999 #2
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|-
| rowspan="3" | 363
| rowspan="3" | [[Fairy's Gift (DM1)|Fairy's Gift]]
| rowspan="3" | タカハシカズキ
| rowspan="3" | ''takahashikazuki''
| rowspan="3" | [[Kazuki Takahashi]], creator of ''[[Yu-Gi-Oh!]]'' and original monster design in ''Duel Monsters''
| data-sort-value="3" | ''WSJ'' 1999 #9
|-
| data-sort-value="4" | ''VJ'' 1999 #2
|-
| data-sort-value="6"| ''DM2 Strategy V2''
|}

<gallery widths="240" heights="240">
Three-Legged Zombies - Top Secret Card - DM1.png      | [[Top Secret Card]] with "[[Three-legged Zombi (DM1)|Three-legged Zombi]]" password
DM1 guidebook "Stuffed Animal" password.png           | ''[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK|Perfect Master BOOK]]'' with "[[Stuffed Animal (DM1)|Stuffed Animal]]" password
"Fairy's Gift" and "Flying Penguin" DM1 passwords.png | ''[[Weekly Shōnen Jump]]'' 1999 #9 with "[[Fairy's Gift (DM1)|Fairy's Gift]]" and "[[Flying Penguin (DM1)|Flying Penguin]]" passwords
V Jump 1999 issue 2 passwords.png                     | ''[[V Jump]]'' 1999 #2 with "[[Takriminos (DM1)|Takriminos]]", "[[Yaranzo (DM1)|Yaranzo]]", and "Three-legged Zombi" passwords
V Jump 1999 issue 4 passwords.png                     | ''V Jump'' 1999 #4 with "Fairy's Gift", "[[Seiyaryu (DM1)|Seiyaryu]]", "Flying Penguin" and "Stuffed Animal" passwords
DM1 passwords in DM2 guidebook.png                    | ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories Game Guide 2|Duel Monsters II: Dark duel Stories Ultimate Strategy Book Volume 2]]'' with seven of the nine passwords
</gallery>

===Prizes===
{{Main|''Yu-Gi-Oh! Duel Monsters'' National Tournament prize cards}}
[[File:DM1 tournament prize cards.png|thumb|right|300px|The prize cards]]
Eight of the fifteen secret cards were awarded at the [[Yu-Gi-Oh! Duel Monsters National Tournament|''Duel Monsters'' National Tournament]] on February 21, 1999. Physical copies of the top four cards were also awarded.

While two of the qualifying cards can also be unlocked with a [[#Passwords|password]], and the four qualifying cards can be obtained by [[#Trading|trading]] from ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories|Duel Monsters II: Dark duel Stories]]'', the Top 4 cards cannot be obtained legitimately by any other means.

{| class="wikitable"
|-
! scope="col" | Position
! scope="col" | #
! scope="col" | Card
! scope="col" | Physical card
|-
| rowspan="4" | Qualifying
| 352 || [[Kanan the Swordmis (DM1)|Kanan the Swordmis]]
| rowspan="4" | 
|-
| 362 || [[Millennium Shield (DM1)|Millennium Shield]]
|-
| 355 || [[Megasonic Eye (DM1)|Megasonic Eye]]
|-
| 357 || [[Yamadron (DM1)|Yamadron]]
|-
| Top 4
| 365
| [[Fiend's Mirror (DM1)|Fiend's Mirror]]
| [[Fiend's Mirror (Normal)|Fiend's Mirror]]
|-
| Top 3
| 356
| [[Super War-lion (DM1)|Super War-lion]]
| [[Super War-Lion (Normal)|Super War-lion]]
|-
| Top 2
| 360
| [[Zera The Mant (DM1)|Zera The Mant]]
| [[Zera the Mant (Normal)|Zera The Mant]]
|-
| Winner
| 364
| [[Black Luster Soldi (DM1)|Black Luster Soldi]]
| [[Black Luster Soldier (Normal)|Black Luster Soldi]]
|}

==Temporarily obtaining cards==
===Fusion Summon===
{{Main|List of ''Yu-Gi-Oh! Duel Monsters'' Fusions}}

The [[Extra Deck]] does not exist in this game. Instead, [[Fusion Summon]]s are performed during Duels by trying to [[Summon]] a monster from the [[hand]] on top of a monster on the [[field]]. The game features 2,159 fusions, resulting in 52 different monsters; often the same monster can be Summoned using a variety of Fusion Material, though eight of the monsters have only a single possible fusion.

All but one of the fusions in ''Duel Monsters'' use only monsters as material. The exception is #063: "[[Harpie Lady Sister (DM1)|Harpie Lady Sister]]", which is fused by equipping #062: "[[Harpie Lady (DM1)|Harpie Lady]]" with #318: "[[Elegant Egotist (DM1)|Elegant Egotist]]". In the ROM, this fusion is handled as an [[effect]], and is not stored with the monster-only fusions.

While the player does not receive a permanent copy of a monster Summoned by fusion, if a fused monster was not previously encountered, an entry for it is added.

===Evolution===
{{pound}}278 "[[Petit Moth (DM1)|Petit Moth]]" and its stages evolve into other cards after being on the field for one turn, in the order shown below. Permanent copies of the evolutions are not added to the player's trunk, though if the player has not previously encountered one of the evolutions, an entry for it is added, similar to fused monsters.

{{pound}}278 "Petit Moth" → #056: "[[Larvae Moth (DM1)|Larvae Moth]]" → #072: "[[Cocoon of Evolutio (DM1)|Cocoon of Evolutio]]" → #057: "[[Great Moth (DM1)|Great Moth]]" → #067: "[[Perfectly Ultimate (DM1)|Perfectly Ultimate]]"

Only one copy of "Petit Moth" can be acquired per game, by defeating [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]] one hundred times (it can also be traded back from later games). Permanent copies of its evolutions can only be acquired by [[#Communication Fusion|Communication Fusion]].

Having only 300 [[ATK]] and 200 [[DEF]], and with AI opponents attacking when they have a stronger monster, it is usually difficult to keep "Petit Moth" on the field for a turn; there are only thirteen monsters in the game with a base ATK of 300 or less. "Petit Moth" can be protected in a few different ways:
* [[Tristan Taylor (Duel Monsters 1)|Tristan Taylor]] does not have any monsters with more than 300 ATK and does not go out of his way to fuse cards, so will not attack an Attack Position "Petit Moth".
* "Petit Moth" is strengthened by all [[Field Spell Card|Field Magic Cards]] in the game. By default, this would only increase its stats to 390 ATK and 260 DEF, which would not be enough to protect it from any additional monsters (the base ATK values featured in the game jump directly from 200 to 300, and from 300 to 400). However, "Petit Moth" is a special case: instead of its stats being increased by 30%, they are increased to 750 ATK and 450 DEF, except for when #330: "[[Forest (DM1)|Forest]]" is active, which instead increases its stats to 975 ATK and 585 DEF. These boosts are enough to protect it against dozens of additional monsters (over a hundred in the case of "Forest").
* #349: "[[Spellbinding Circl (DM1)|Spellbinding Circl]]" reduces the targeted monster's [[Level (stat boost)|level]] by 1; using it on a monster with a level of 0 reduces its level to -1, which reduces its ATK and DEF to 60% of their original values. This would require a separate copy of "Spellbinding Circl" for each of the opponent's monsters, as well as an extra turn for each monster to be debuffed. This would protect "Petit Moth" against any monsters with up to 500 ATK, and could be used in conjunction with a Field Magic Card increasing the ATK of "Petit Moth", to protect against additional monsters.
* #348: "[[Swords of Revealin (DM1)|Swords of Revealin]]" prevents the opponent from attacking for three turns.

The game's code allows [[Petit Moth (DM1)#Uses|certain Equip Cards]] to be used on "Petit Moth". However, since only a single card can be played per turn, and because "Petit Moth" is evolved into "Larvae Moth" as soon as its controller's next turn starts, it is not actually possible to equip any cards to "Petit Moth" before it evolves.

==Rules==
''Yu-Gi-Oh! Duel Monsters'' predates the ''[[Yu-Gi-Oh! Official Card Game]]'' and features its own rules for ''[[Duel Monsters]]'', most of which are based on the [[Yu-Gi-Oh! (manga)|manga]] [[Duel Monsters (manga)|''Duel Monsters'' rules]].

===Deck construction===
* A player's [[Main Deck|Deck]] must contain exactly 40 cards.
** This is a hard cap: even when editing the Deck, only up to 40 cards can be used. Because of this, to change cards requires that a card first be removed from the Deck, before the new card can be added.
* A Deck can have up to 40 copies of the same card.

===Duels===
====Setup====
* Each player starts with 8000 [[LP]] and five cards in their hand.
* In campaign, the human player always goes first.

====Playing cards====
* Except for the first turn, the player draws one card at the beginning of their turn.
* A player may play one card per turn.
* A player can Summon a [[Monster Card|monster]] into one of the five available zones or activate a [[Spell Card|Magic Card]].
* If a player attempts to Summon a monster into a zone occupied by another monster, the game will attempt to [[#Fusion Summon|fuse]] the monsters. If the Fusion is valid, a new monster will be Summoned into the zone. If the Fusion is invalid, the second monster will replace the first.

====Modifying ATK/DEF====
[[File:DM1 ATK overflow.png|thumb|right|160px|#067: "[[Perfectly Ultimate (DM1)|Perfectly Ultimate]]" with an ATK of 1648, rather than 11648, due to the overflow glitch]]
* Certain Magic Cards will modify the [[ATK]] and [[DEF]] of a chosen monster by boosting or reducing its [[Level (stat boost)|level]]: [[Equip Spell Card|Equip Magic Cards]] will boost the monster's level by 1 each, to a maximum of 2 levels, while #349: "[[Spellbinding Circl (DM1)|Spellbinding Circl]]" will reduce its level by 1. Each level increases a monster's ATK and DEF by 60%; #303: "[[Dark Energy (DM1)|Dark Energy]]" is the only card that specifies this increase.
** "Spellbinding Circl" can reduce a monster's level to -1. In this case, its ATK and DEF are reduced to 60% of their original values; for example, #207: "[[Droll Bird (DM1)|Droll Bird]]", with original ATK and DEF of 600 and 500, has its ATK and DEF become 360 and 300.
** Every monster is a valid target for at least one Equip Card. Nineteen monsters<!-- #001: "[[B.eye White Dragon (DM1)|B.eye White Dragon]]", #037: "[[Gaia the Dragon Ch (DM1)|Gaia the Dragon Ch]]", #043: "[[Karbonala Warrior (DM1)|Karbonala Warrior]]", #069: "[[Thousand Dragon (DM1)|Thousand Dragon]]", #082: "[[Red-eyes B. Dragon (DM1)|Red-eyes B. Dragon]]", #100: "[[Battle Warrior (DM1)|Battle Warrior]]", #118: "[[Supporter in the S (DM1)|Supporter in the S]]", #136: "[[Witty Phantom (DM1)|Witty Phantom]]", #156: "[[Hard Armor (DM1)|Hard Armor]]", #160: "[[M-warrior 1 (DM1)|M-warrior #1]]", #161: "[[M-warrior 2 (DM1)|M-warrior #2]]", #172: "[[Armaill (DM1)|Armaill]]", #186 "[[Fiend Reflection 2 (DM1)|Fiend Reflection#2]]", #191: "[[LaLa Li-oon (DM1)|LaLa Li-oon]]", #217: "[[B. Skull Dragon (DM1)|B. Skull Dragon]]", #247: "[[Root Water (DM1)|Root Water]]", #262: "[[The Little Swordsm (DM1)|The Little Swordsm]]", #288: "[[Dark Artist (DM1)|Dark Artist]]", #358: "[[Seiyaryu (DM1)|Seiyaryu]]" --> are valid targets for only one Equip Card.
* [[Field Spell Card|Field Magic Cards]] affect all monsters on the field of specified [[Type]]s. A Field Card may either increase a monster's ATK and DEF by 30%, decrease them by 30%, or have no effect. There can only be one Field Card active at a time; if a Field Card is active, any further Field Cards attempted to be played will be destroyed<!-- by either player? or can the opponent of the player that played the Field Card successfully replace it by playing one themselves? -->. This increase/decrease does not count towards the number of levels.
** There are several monsters which are affected, or unaffected, by certain Field Cards contrary to their Type, as well as several which receive additional boosts over the normal 30% or are otherwise modified:
*** #278: "[[Petit Moth (DM1)|Petit Moth]]", whose stats are changed from 300 ATK and 200 DEF to 750 ATK and 450 DEF, before gaining its 30% or 0% boost: it has 975 ATK and 585 DEF in #330: "[[Forest (DM1)|Forest]]" and 750 ATK and 450 DEF in any other field, excluding the default field.
*** [[PaniK's monsters]], whose stats are rounded to the nearest 100 after gaining their 30% boost.
*** #074: "[[Giant Rock Soldier (DM1)|Giant Rock Soldier]]", which is affected by #332: "[[Mountain (DM1)|Mountain]]", contrary to its Type.
*** #027: "[[Beaver Warrior (DM1)|Beaver Warrior]]" and #047: "[[Torike (DM1)|Torike]]", which are not affected by "Forest", contrary to their Type.
*** There are no Field Cards which affect "Torike" or any [[Reptile]] monsters.
*** [[Fairy]] monsters (under #335: "[[Yami (DM1)|Yami]]") and [[Machine]] and [[Pyro]] monsters (under #334: "[[Umi (DM1)|Umi]]") only receive negative effects from Field Cards. These are the only monsters to receive negative effects.
*** Several monsters have 0 ATK or DEF; these values are unchanged by a Field Card even if it does affect the non-zero value.
** Because of how they are implemented (as a set of hardcoded values), boosts from Field Cards are applied before level boosts, though this has no in-game effect.
* Due to a glitch, ATK and DEF values of over 9999 do not work correctly; the 10,000's digit is ignored. For example, #067: "[[Perfectly Ultimate (DM1)|Perfectly Ultimate]]", which has an original ATK of 3500, would have a boosted ATK of 11648 when boosted by a Field Card and two levels, but this glitch makes its functional ATK only 1648. This glitch can only affect the ATK values of "Perfectly Ultimate" and #217: "[[B. Skull Dragon (DM1)|B. Skull Dragon]]", as no other original ATK and DEF values in the game are over 3000; a value of 3000 becomes 9984 after being boosted by a Field Card and two levels.

====Battling====
[[File:Yu-Gi-Oh! Duel Monsters (J) -S- 2.png|thumb|Battle screen showing #048: "[[Sangan (DM1)|Sangan]]" attacking #167: "[[Ancient Jar (DM1)|Ancient Jar]]"]]
* Each turn, the player must decide if each of their monsters is going to attack or defend.
** If "attack" is selected, the monster is put in [[Attack Position]] and must attack a monster on the opponent's side of the field. If there are none, it will attack the opponent directly. A monster cannot be left in Attack Position at the end of a turn, without declaring an attack, unless it is the first turn or another card is preventing it from attacking.
*** When a monster attacks a player directly, the monster's [[ATK]] is deducted from the LP of the attacked player.
*** When a monster attacks an Attack Position monster, the monster with lower ATK is [[destroy]]ed and the difference is deducted from the LP of the controller of the destroyed monster. If both monsters have the same ATK, they are both destroyed.
*** When a monster attacks a Defense Position monster, if the attacking monster's ATK is higher than the defending monster's [[DEF]], the defending monster is destroyed. If the attacking monster's ATK is equal to or lower than the DEF of the defending monster, the difference is deducted from the LP of the controller of the attacking monster, and neither monster is destroyed.
** If "defend" is selected, the monster is put in [[Defense Position]].
* The turn ends after the player has chosen an action for all of their monsters.

====Winning====
* When a player's [[LP]] are reduced to 0, the other player is the winner.
* If a player's hand is empty, the Duelist with the higher LP wins
* If a player has all five "[[Exodia]]" pieces in their hand, they win.

==Development==
===Announcements===
In ''[[Weekly Shōnen Jump]]'' 1998 #26, released on May 25, production of ''Yu-Gi-Oh! Duel Monsters'' was announced. The announcement featured screenshots of the game including the main menu, a Duel in progress, and the [[Puppeteer of Doom (Duel Monsters 1)|Puppeteer of Doom]] in the campaign mode. All three screens were changed significantly by the time the game was released. The feature also showed the in-game artworks of "[[B.eye White Dragon (DM1)|B.eye White Dragon]]" and "[[Hitotsu-me Giant (DM1)|Hitotsu-me Giant]]", and contained an invitation for people to submit designs for monsters to be included in ''Duel Monsters'' and ''[[Yu-Gi-Oh! Monster Capsule: Breed and Battle]]'', which was being developed alongside it. The deadline for submissions was June 25, 1998. Applicants were asked to put their monster's name and picture on a postcard, and optionally its powers and stats, along with their name, address, phone number and age, and send the postcard to the Yu-Gi-Oh! Koku address. Copyright of the winning entries was to be taken over by the organizers.

''Weekly Shōnen Jump'' 1998 #28, released on June 8, contained the in-game artworks and some information on "[[Ryu-kishin (DM1)|Ryu-kishin]]" and "[[Feral Imp (DM1)|Feral Imp]]".

''Weekly Shōnen Jump'' 1998 #36, released on August 3, mentioned that players could play against and trade with friends using the Game Link Cable or play against characters appearing in the [[Yu-Gi-Oh! (manga)|manga]]. It contained a screenshot of [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]] in campaign mode. The issue showcased four of the winners of the monster-design contest from issue #26; "[[Claw Reacher (DM1)|Claw Reacher]]", "[[Hard Armor (DM1)|Hard Armor]]", "[[Turtle Tiger (DM1)|Turtle Tiger]]", and "[[Beast of Forest Destruction]]". However, "Beast of Forest Destruction" was not included in the final version of the game.

''Weekly Shōnen Jump'' 1998 #40, released on August 31, announced that the game would contain 350 cards. It contained artworks for a number of cards and showed a screenshot of [[Mai Valentine (Duel Monsters 1)|Mai Valentine]] in campaign mode, using Super Gameboy colors.

''Weekly Shōnen Jump'' 1998 #42, released on September 14, announced that trial versions of the game would be playable at six stores in Japan on the weekend of September 26 and 27, 1998 and gave the address and phone number of each venue. It explained that attendees who answered a questionnaire would be presented with a "[[Seiyaryu (collector's card)|Seiyaryu]]" promotional card, "[[Seiyaryu (DM1)|Seiyaryu]]" being a card [[Kazuki Takahashi]] designed for the game.

''V Jump'' 1998 #11, released on September 21, contained a screenshot of a Duel in progress and an explanation of everything that was visible on screen and the rules for monster [[battle]]s. It showcased four winning entrants from the monster-design contest; "[[Dark Shade (DM1)|Dark Shade]]", "[[Twin Long Rods 1 (DM1)|Twin Long Rods #1]]", "[[Genin (DM1)|Genin]]", "[[Doron (DM1)|Doron]]", and "[[Larvas (DM1)|Larvas]]".

''Weekly Shōnen Jump'' 1998 #45, released on October 5, announced that the game would be released in December 1998. It contained a newer version of the main menu, different than the final version, but more closely resembling it than the one featured in the 1998 #26 issue. It also contained screenshots of the Deck edit screen, the Stage 1 opponents and the Stage 2 main screen. All screenshots used Super Gameboy colors.

''Weekly Shōnen Jump'' 1998 #47, released on October 19, contained the precise release date of the game; December 17, 1998. It announced that a [[Yu-Gi-Oh! Duel Monsters National Tournament|national tournament]] would take place, the winners of which would receive [[Yu-Gi-Oh! Duel Monsters National Tournament prize cards|in-game cards and metallic real-world versions]] of the cards. It showed "[[Zera the Mant (Normal)|Zera the Mant]]" and "[[Black Luster Soldier (Normal)|Black Luster Soldier]]" in the style of the "[[collector's cards]]" that existed before the ''[[Yu-Gi-Oh! Official Card Game]]''. The issue contained information on the [[Yu-Gi-Oh! Duel Monsters promotional cards|''Yu-Gi-Oh! Duel Monsters'' bundled promotional cards]] and the game's [[Initial Deck]].

''Weekly Shōnen Jump'' 1998 #48, released on October 26, contained information about the national tournament, including its schedule; qualifying rounds in mid-January 1999, second round of qualifiers in late January to early February, and finals in mid February. The first qualifying round took place at approximately 100 stores throughout Japan, with a rare card and qualification for the next second round awarded to winners. The second qualifying round was to take place at twelve locations, with a rare card and qualification for the finals awarded to winners. The final was to take place at Tokyo between 16 regional winners, with "[[Fiend's Mirror (DM1)|Fiend's Mirror]]" awarded to the top four, "[[Super War-lion (DM1)|Super War-lion]]" to the top three, "[[Zera The Mant (DM1)|Zera The Mant]]" to the top two and "[[Black Luster Soldi (DM1)|Black Luster Soldi]]" and the ten [[Yu-Gi-Oh! Duel Monsters promotional cards|''Duel Monsters'' bundled promotional cards]] awarded to the winner.

''Weekly Shōnen Jump'' 1998 #50, released November 9, published information on the first two stages of the game's campaign mode. It also included details of the trials that had been announced in the 1998 #42 issue. 2000 people attended; 600 got to play while the others were allowed to watch on a screen.

''Weekly Shōnen Jump'' 1998 #52, released November 21, contained information on a visit Kazuki Takahashi made to the building where the game was developed.

===Prototypes===
An earlier version of the game featured a different graphic for the main menu. It did not include the copyright text, had a different font for the text ''Duel Monsters'' (デュエルモンスターズ), a different picture of [[Yami Yugi (Duel Monsters 1)|Yami Yugi]], and different text for the menu options:<ref name="wsj 1998-26">''[[Weekly Shōnen Jump]]'' 1998 #26, released May 25, 1998</ref><ref>''[[V Jump]]'' 1998 #10, released August 1998</ref>
* '''VS CPU''' (対　ＣＰＵ ''Tai Shī Pī Yū'') instead of "Campaign" (キャンペーン ''Kyanpēn'')
* '''VS MAN''' (対　ＭＡＮ ''Tai Man'') instead of "Versus" (たいせん ''Taisen'')
* '''Trade''' (こうかん ''Kōkan'') instead of "Trade" (トレード ''Torēdo'')
* '''Collection''' (コレクション ''Korekushon'') instead of "Records" (せいせき ''Seiseki'')

<gallery widths="160" heights="144">
DM1 early main menu.png         | Main menu in ''Weekly Shōnen Jump'' 1998 #26
DM1 main menu - WSJ-1998-45.png | Main menu in ''Weekly Shōnen Jump'' 1998 #45
YugiohDuelMonstersGB-2.png      | Final version of the main menu
</gallery>

An earlier version of the [[Puppeteer of Doom (Duel Monsters 1)|Puppeteer of Doom]] featured the [[Kaiba puppet]] more prominently with only a silhouette of the Puppeteer visible behind it.<ref name="wsj 1998-26" />

<gallery widths="160" heights="144">
Puppeteer-DM1 - WSJ-1998-26.png | Puppeteer in ''Weekly Shōnen Jump'' 1998 #26
Puppeteer-DM1.png               | Puppeteer in the final version
</gallery>

===Card-design contest===
Fans were able to submit ideas for cards to be included in the game. Four of the winners were published in the 1998 #36 issue of ''[[Weekly Shōnen Jump]]'' (''WSJ''). Another five were published in the 1998 #11 issue of ''[[V Jump]]'' (''VJ''). However one of the nine, "[[Beast of Forest Destruction]]" was not included in the final version of the game. 

{| class="wikitable"
|-
! scope="col" | <abbr title="Number">#</abbr>
! scope="col" | Card
! scope="col" | Designer
! scope="col" | Original artwork
! scope="col" | Game artwork
! scope="col" | Winner announced
|-
| 155
| "[[Larvas (DM1)|Larvas]]"
| Atsushi Nakao (中尾篤志)
| [[File:Larvas - card design contest.png|160px]]
| [[File:Larvas-DM1-JP-VG.png]]
| ''VJ'' 1998 #11
|-
| 156
| "[[Hard Armor (DM1)|Hard Armor]]"
| Kiichi Hayashi (林 貴一)
| [[File:Hard Armor - card design contest.png|160px]]
| [[File:HardArmor-DM1-JP-VG.png]]
| ''WSJ'' 1998 #36
|-
| 178
| "[[Claw Reacher (DM1)|Claw Reacher]]"
| Hidekazu Ozaki (尾崎秀和)
| [[File:Claw Reacher - card design contest.png|160px]]
| [[File:ClawReacher-DM1-JP-VG.png]]
| ''WSJ'' 1998 #36
|-
| 181
| "[[Dark Shade (DM1)|Dark Shade]]"
| Junko Kubo (久保淳子)
| [[File:Dark Shade - card design contest.png|160px]]
| [[File:DarkShade-DM1-JP-VG.png]]
| ''VJ'' 1998 #11
|-
| 184
| "[[Genin (DM1)|Genin]]"
| Manabu Iwasaka (岩坂学)
| [[File:Genin - card design contest.png|160px]]
| [[File:Genin-DM1-JP-VG.png]]
| ''VJ'' 1998 #11
|-
| 193
| "[[Turtle Tiger (DM1)|Turtle Tiger]]"
| Masahiro Yamamoto (山本将弘)
| [[File:Turtle Tiger - card design contest.png|160px]]
| [[File:TurtleTiger-DM1-JP-VG.png]]
| ''WSJ'' 1998 #36
|-
| 195
| "[[Doron (DM1)|Doron]]"
| Takeshi Fujii (藤井武志)
| [[File:Doron - card design contest.png|160px]]
| [[File:Doron-DM1-JP-VG.png]]
| ''VJ'' 1998 #11
|-
| 206
| "[[Twin Long Rods 1 (DM1)|Twin Long Rods #1]]"
| Yasushi Ibusuki (指宿泰志)
| [[File:Twin Long Rods 1 - card design contest.png|160px]]
| [[File:TwinLongRods1-DM1-JP-VG.png]]
| ''VJ'' 1998 #11
|-
| n/a
| "[[Beast of Forest Destruction]]"
| Kentaro Miyamoto (宮本健太朗)
| [[File:Beast of Forest Destruction - card design contest.png|160px]]
| [[File:BeastofForestDestruction-DM1-JP-VG-CA.png|160px]]
| ''WSJ'' 1998 #36
|}

== Glitches ==
* [[ATK]] and [[DEF]] values over 9999 [[#Modifying ATK/DEF|do not work correctly]].
* When played on a [[wikipedia:PAL|PAL]]<!-- needs confirmed if this happens with SGBs from other regions --> [[wikipedia:Super Game Boy|Super Game Boy]], if the player attempts to access the [[#Versus|versus]] or [[#Trade|trade]] screens, [[Tea Gardner (Duel Monsters 1)|Tea Gardner]] will not appear, though the player is still unable to complete the action.

== Promotional cards ==
{{Main|''Yu-Gi-Oh! Duel Monsters'' promotional cards|''Yu-Gi-Oh! Duel Monsters'' trial session promotional card|''Akamaru Jump'' raffle card}}

Each copy of ''Duel Monsters'' came with three [[collector's cards]], randomly selected from the following ten:<ref name="konami dm1 page" />
* "[[Black Skull Dragon (collector's card)|Black Skull Dragon]]"
* "[[Castle of Dark Illusions (collector's card)|Castle of Dark Illusions]]"
* "[[Dark Magician (collector's card)|Dark Magician]]"
* "[[Hitotsu-Me Giant (collector's card)|Hitotsu-Me Giant]]"
* "[[Mirror Force (collector's card)|Mirror Force]]"
* "[[Monster Reborn (collector's card)|Monster Reborn]]"
* "[[Red-Eyes Black Dragon (collector's card)|Red-Eyes Black Dragon]]"
* "[[Ryu-Kishin (collector's card)|Ryu-Kishin]]"
* "[[Summoned Skull (collector's card)|Summoned Skull]]"
* "[[Swords of Revealing Light (collector's card)|Swords of Revealing Light]]"

Another collector's card, "[[Seiyaryu (collector's card)|Seiyaryu]]", was given out at trial session for this game. Five copies of that card were also used as prizes in an ''[[Akamaru Jump]]'' raffle.

== Game guides ==
{{Main|''Yu-Gi-Oh! Duel Monsters Perfect Master BOOK''|''Yu-Gi-Oh! Duel Monsters Perfect Master BOOK Volume 2''}}
Two game guides for ''Duel Monsters'' were published in Japan by [[Shueisha]]: ''[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK]]'', published on December 21, [[1998]],<ref>{{cite book|title=Yu-Gi-Oh Duel Monsters Perfect Master BOOK|date=December 21, 1998|publisher=[[Shueisha]]|language=Japanese|isbn=4-08-779009-6|page=Back cover|nopp=y}}</ref><ref>{{cite web | url = http://www.amazon.co.jp/dp/4087790096 | title = 遊☆戯☆王デュエルモンスターズパーフェクトマスターBOOK (上巻) (Vジャンプブックス―ゲームシリーズ) [単行本&#93; | trans-title = Yu-Gi-Oh! Duel Monsters Perfect Master BOOK (Volume 1) (V Jump Books - Game Series) [Paperback&#93; | language = Japanese | publisher = Amazon.co.jp | accessdate = June 27, 2013 }}</ref> and ''[[Yu-Gi-Oh! Duel Monsters Perfect Master BOOK Volume 2]]'', published in January [[1999]].<ref>{{cite web | url = http://www.amazon.co.jp/dp/4087790126 | title = 遊☆戯☆王デュエルモンスターズパーフェクトマスターBOOK (下巻) (Vジャンプブックス―ゲームシリーズ) [単行本&#93; | trans-title = Yu-Gi-Oh! Duel Monsters Perfect Master BOOK (Volume 2) (V Jump Books - Game Series) [Paperback&#93; | language = Japanese | publisher = Amazon.co.jp | accessdate = June 27, 2013 }}</ref> Neither guide included any bundled promotional cards.

==Manga scenes used==
The following scenes from the manga were used to create graphics for this game.

<div style="display: flex; flex-wrap: wrap;">
{{Multiple image
| align  = left
| image1 = DM ST1.png
| width1 = 160
| image2 = Ship - Duel 64.png
| width2 = 69
| footer = Stage 1: Ship ([[Yu-Gi-Oh! - Duel 064|Duel 64]])
}}

{{Multiple image
| align  = left
| image1 = Hiroto Honda-G1.png
| width1 = 160
| image2 = Common room - Duel 64.png
| width2 = 352
| footer = Stage 1 opponents' backdrop: Common room ([[Yu-Gi-Oh! - Duel 064|Duel 64]])
}}

{{Multiple image
| align  = left
| image1 = Yugi Muto-G1.png
| width1 = 160
| image2 = Yugi - Duel 80 - impressed.png
| width2 = 166
| footer = [[Yugi Muto (Duel Monsters 1)|Yugi Muto]] ([[Yu-Gi-Oh! - Duel 080|Duel 80]])
}}

{{Multiple image
| align  = left
| image1 = DM jonouchi.png
| width1 = 160
| image2 = Jonouchi - Duel 79 - wins Red-Eyes.png
| width2 = 201
| footer = [[Joey Wheeler (Duel Monsters 1)|Joey Wheeler]] ([[Yu-Gi-Oh! - Duel 079|Duel 79]])
}}

{{Multiple image
| align  = left
| image1 = DM ST2.png
| width1 = 160
| image2 = Duelist Kingdom island - manga.png
| width2 = 285
| footer = Stage 2: [[Duelist Kingdom (island)|Duelist Kingdom]] ([[Yu-Gi-Oh! - Duel 065|Duel 65]])
}}

{{Multiple image
| align  = left
| image1 = Weevil Underwood-DM1.png
| width1 = 160
| image2 = Haga - Duel 65 - smirk.png
| width2 = 134
| footer = [[Weevil Underwood (Duel Monsters 1)|Weevil Underwood]] ([[Yu-Gi-Oh! - Duel 065|Duel 65]])
}}

{{Multiple image
| align  = left
| image1 = Mai Valentine-DM1.png
| width1 = 160
| image2 = Mai - Duel 77 - laughing.png
| width2 = 88
| footer = [[Mai Valentine (Duel Monsters 1)|Mai Valentine]] ([[Yu-Gi-Oh! - Duel 077|Duel 77]])
}}

{{Multiple image
| align  = left
| image1 = Rex Raptor-DM1.png
| width1 = 160
| image2 = Ryuzaki - Duel 79 - I won.png
| width2 = 174
| footer = [[Rex Raptor (Duel Monsters 1)|Rex Raptor]] ([[Yu-Gi-Oh! - Duel 079|Duel 79]])
}}

{{Multiple image
| align  = left
| image1 = Mako Tsunami-DM1.png
| width1 = 160
| image2 = Ryota - Duel 71 - pointing.png
| width2 = 56
| footer = [[Mako Tsunami (Duel Monsters 1)|Mako Tsunami]] ([[Yu-Gi-Oh! - Duel 071|Duel 71]])
}}

{{Multiple image
| align  = left
| image1 = Mokuba Kaiba-DM1.png
| width1 = 160
| image2 = Mokuba - Duel 74 - I trust.png
| width2 = 259
| footer = [[Mokuba Kaiba (Duel Monsters 1)|Mokuba Kaiba]] ([[Yu-Gi-Oh! - Duel 074|Duel 74]])
}}

{{Multiple image
| align  = left
| image1 = Puppeteer-DM1.png
| width1 = 160
| image2 = Ventriloquist - Duel 74.png
| width2 = 193
| footer = [[Puppeteer of Doom (Duel Monsters 1)|Puppeteer of Doom]] ([[Yu-Gi-Oh! - Duel 074|Duel 74]])
}}

{{Multiple image
| align  = left
| image1 = PaniK-DM1.png
| width1 = 160
| image2 = Player Killer of Darkness - Duel 80 - adding Star Chips.png
| width2 = 190
| footer = [[PaniK (Duel Monsters 1)|PaniK]] ([[Yu-Gi-Oh! - Duel 080|Duel 80]])
}}

{{Multiple image
| align  = left
| image1 = Bandit Keith-DM1.png
| width1 = 160
| image2 = Bandit Keith - Duel 92 - Decks in jacket.png
| width2 = 94
| footer = [[Bandit Keith (Duel Monsters 1)|Bandit Keith]] ([[Yu-Gi-Oh! - Duel 092|Duel 92]])
}}
</div>
{{clear}}

== Gallery ==
<gallery>
YugiohDuelMonstersGB.jpg | Cover
DM1 box back.jpg         | Back cover
DM1 SGB.png              | ''Duel Monsters'' as it appears when played on a [[wikipedia:Super Game Boy|Super Game Boy]]
</gallery>

== Reception ==
''Duel Monsters'' sold 1.6 million copies,<ref>{{cite web |url=http://www.the-magicbox.com/Chart-JPPlatinum.shtml |title=Japan Platinum Game Chart |publisher=The Magic Box |accessdate=April 25, 2017 }}</ref> making it the [[wikipedia:List of best-selling Game Boy video games|34th-best-selling Game Boy/Game Boy Color title]] of all time.

==External links==
* [https://tcrf.net/Yu-Gi-Oh!_Duel_Monsters ''The Cutting Room Floor'' page]
* [https://datacrystal.tcrf.net/wiki/Yu-Gi-Oh!_Duel_Monsters Data Crystal page]
{{The VG Resource external links
| console = gb
| sprites = 1
}}
* [https://retroachievements.org/game/595 Retro Achievements page]
* [https://github.com/Darrman/DM1Translation English fan translation project]

== References ==
<references />

{{Yu-Gi-Oh! Duel Monsters}}
{{Yu-Gi-Oh! Duel Monsters (video game) characters}}
{{Video games}}

[[Category:Yu-Gi-Oh! Duel Monsters (video game)| ]]
[[Category:Yu-Gi-Oh! Duel Monsters (video game series)|Duel Monsters]]
[[Category:Video games|Duel Monsters]]