{{VGInfoboxrename|Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelists|https://www.konami.com/games/eu/en/topics/17742/}}{{Infobox video game| image = {{ #vardefine: $rand | {{ #choose: Yugi | Kaiba | Joey }} }}<!-- --><div class="switcher-container" style= "margin: 0 auto; max-width: 240px; text-align: left;"><!-- --><div><!-- -->[[File:YuDM4-GiBox-Oh! Duel Monsters IVJP- Yugi DeckYugiDeck.jpg|300px255px|Yugi Deck]]<!-- --><span class="switcher-label" {{ #ifeq: {{ #var: $rand }} | Yugi | data-switcher-default="true" }}">Show ''Yugi Deck'' box</span><!-- --></div><!-- --><div><!-- -->[[File:YuDM4-GiBox-Oh! Duel Monsters IVJP- Kaiba DeckKaibaDeck.jpg|300px255px|Kaiba Deck]]<!-- --><span class="switcher-label" {{ #ifeq: {{ #var: $rand }} | Kaiba | data-switcher-default="true" }}">Show ''Kaiba Deck'' box</span><!-- --></div><!-- --><div><!-- -->[[File:YuDM4-GiBox-Oh! Duel Monsters IVJP- JonouchiJonouchiDeck.jpg|300px255px|Joey Deck]]<!-- --><span class="switcher-label" {{ #ifeq: {{ #var: $rand }} | english name Joey | data-switcher-default= Yu"true" }}">Show ''Joey Deck'' box</span><!-- -Gi-Oh></div><! Duel Monsters 4: Battle of Great Duelist----></div>| kanji name ja_name = 遊戯王デュエルモンスターズ４　{{Ruby|遊|ユウ}}☆{{Ruby|戯|ギ}}☆{{Ruby|王|オウ}}デュエルモンスターズ{{Ruby|４|フォー}}　{{Ruby|最強決闘者戦記|バトル　オブ　グレイト　デュエリスト}}| romaji name romaji_name = Yūgiō Dyueru Monsutāzu 4 Fō: Batoru obu Obu Gureito Dyuerisuto| platform = Game Boy Color| languages = Japanese| developer = [[Konami]]| publisher = Konami| platform ja_release_date = Game Boy ColorDecember 7, 2000| rating series = Yu-Gi-Oh! Duel Monsters (video game series)| genre prev = Card BattleYu-Gi-Oh! Dark Duel Stories| release date next = {{flagYu-Gi-Oh! Duel Monsters 5: Expert 1|Japan}} December 7, 2000guide_book_1 = Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist Game Guide 1| galleries guide_book_2 = [[Gallery of Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist cards|Card gallery]]Game Guide 2

'''''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist''''' (遊戯王デュエルモンスターズ４　{{Ruby|遊|ユウ}}☆{{Ruby|戯|ギ}}☆{{Ruby|王|オウ}}デュエルモンスターズ{{Ruby|４|フォー}}　{{Ruby|最強決闘者戦記|バトル　オブ　グレイト　デュエリスト}} ''Yūgiō Dyueru Monsutāzu 4 Fō: Batoru obu Obu Gureito Dyuerisuto'') is a Japan -only ''Yu-Gi-Oh !'' video game for the Game Boy Color, and the fourth installment in the [[Yu-Gi-Oh! Duel Monsters (video game series)|''Duel Monsters'' series]], preceded by ''[[Yu-Gi-Oh! Dark Duel Stories]]''. It was released December 7, 2000 as three separate versions ('''''Yugi Deck''''', '''''Kaiba Deck''''', and Jonouchi '''''Joey Deck'''''), each being able to use only a certain selection of the 900 available cards.

* [[Slifer the Sky Dragon (DM4)|Slifer the Sky Dragon]] can be used in the ''Yugi Deck '' version, obtained in the ''Kaiba Deck '' or ''Joey Deck'' version by defeating [[Yami Yugi (Duel Monsters 4)|Yami Yugi]].* [[Obelisk the Tormentor (originalDM4)|Obelisk the Tormentor]] can be used in the ''Kaiba Deck '' version, obtained in the Jonouchi ''Yugi Deck'' or ''Joey Deck '' version by defeating [[Yami Bakura(Duel Monsters 4)|Yami Bakura]].* [[The Winged Dragon of Ra (originalDM4)|The Winged Dragon of Ra]] can be used in the Jonouchi ''Joey Deck '' version, obtained in the ''Yugi Deck '' or ''Kaiba Deck'' version by defeating [[MarikIshtar (Duel Monsters 4)|Marik Ishtar]].

* A stage to the left of the first stage can be unlocked by entering Passwords for either of its opponents; [[Yugi Gonbutori (Duel Monsters 4)|Yugi Gonbutori]] and [[Kaiser Umiuma (Duel Monsters 4)|Kaiser Umiuma]].* The opponent [[Strings (Duel Monsters 4)|Strings]] is added. [[Bandit Keith (Duel Monsters 4)|Bandit Keith]] and [[Maximillion Pegasus (Duel Monsters 4)|Maximillion Pegasus]], who were present in ''Duel Monsters 2'', but not ''Duel Monsters 3'' have been re-added.* Tristan, Joey, Yugi, Kaiba, Seto, Heishin, DarkNite/Nitemare and Shadi are not available as opponents.* The stages certain opponents appear in are changed.* CPU opponents' Decks and cards dropped are changed.* CPU opponents are now able to activate monster effects.

* The [[Level]]s of many cards are changed. Anything , with at least 1400 Levels generally being based on [[ATK]] or and [[DEF]] . (See [[#Stat calculations|stat calculations]] below.)* The [[Deck Cost]] of monsters is changed. It is now exponentially proportional to whichever is Level 5 or higherof the monster's ATK and DEF, with the Deck Cost resetting when the higher stat reaches an amount that requires an increased number of Tributes.* "[[Petit Moth (DM4)|Petit Moth]]", its evolutions and "[[Multiply (DM4)|Multiply]]" are now [[Limited]].* A number of cards have their artworks changed.

{{See also|List of ''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'' cards|Gallery of ''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'' cards}} ''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'' contains 900 cards, including:* The 800 standard cards, which appeared in ''[[Yu-Gi-Oh! Dark Duel Stories|Duel Monsters III]]''* 7 cards, which appeared in ''Duel Monsters III'' as constructed cards, appear in this game as regular cards* 33 new cards from the [[Yu-Gi-Oh! (manga)|manga]], up until Duel 188: {{chapter|Yu-Gi-Oh!|188}}<!-- 803 to 812 (10), 832 to 840 (9), 842, 850, 853, 854, 879 to 883 (5), 895, 897 to 900 (4) -->* 60 other cards ==Player characters==<gallery widths="160" heights="144" mode="nolines">Yugi-DM4.png | [[Yugi Muto (Duel Monsters 4)|Yugi]]Kaiba-DM4.png | [[Seto Kaiba (Duel Monsters 4)|Kaiba]]Joey-DM4.png | [[Joey Wheeler (Duel Monsters 4)|Joey]]</gallery>

Players must beat each player Each opponent in a stage must be defeated 5 times (or more in some stages), in order to get to unlock the next stage. Once the player beats a character 5 timesAfter this, he or she may keeping on dueling them opponents can continue to be battled for more pointsand card drops. The first stage is [[Domino Park (square)|Domino Park]]. The second stage is the [[bridge underpass]]. The third stage, is the boss, [[Maximillion Pegasus (Duel Monsters 4)|Maximillion Pegasus]]. Here are After defeating Pegasus five times, the list of characters that a player may duel against is given the password for the ending credits and an additional Dark Stage appears, with [[Mai Valentine (Duel Monsters 4)|Mai Valentine]] as an opponent. The opponent for this stage can be changed with a [[#Password|password]]. The secret stage can be unlocked by entering the [[#Password|password]] for one of its two characters are . It is found by navigating left from the first stage. Like the same in Dark Stage, only one opponent will be available at a time and the 3 versions):opponent can be changed with a password.

{| class="wikitable! Opponents! Image" style="clear: right;"

! colspanscope="2col" | Stage 1! scope="col" | Opponents

* <gallery widths="160" heights="144" mode="nolines">Kaiser Umiuma-DM4.png | [[Mako Tsunami Kaiser Umiuma (Duel Monsters 4)|Mako TsunamiKaiser Umiuma]]* </gallery>|} ===Versus===[[Espa Roba File:DM4-Joey Versus menu.png|thumb|right|The versus menu (''Joey Deck'')]]Players can battle other players with a copy of ''Yu-Gi-Oh! Duel Monsters 4)'' using the [[wikipedia:Game Link Cable|Espa RobaGame Link Cable]]via the versus menu. The Deck can be altered, and a Deck Capacity limit can be chosen, on this screen. Allowed limits are 500, 700, 1000, 2000 and 9999. {{clear}} ===Password===* [[Rex Raptor (Duel Monsters 4)File:DM4 Password menu.png|thumb|right|Rex RaptorThe password menu]]Cards can be added to the player's chest in the password menu, by entering eight-digit [[password]]s from ''[[OCG]]''/''[[TCG]]'' cards. There are a few non-card passwords used to unlock other features. {| class="wikitable"|-|+ Non-card passwords* |-! scope="col" | Password! scope="col" | Action|-| 17232574| [[Weevil Underwood Solomon Muto (Duel Monsters 4)|Weevil UnderwoodGrandpa]]gives the player an extra card after each Duel|-* | 71837829| Change the Dark Stage opponent to [[Simon Muran Mai Valentine (Duel Monsters 4)|Simon MuranMai Valentine]]| -| 45442120| Change the Dark Stage opponent to [[File:DM4 ST1.pngBandit Keith (Duel Monsters 4)|160px|Stage 1Bandit Keith]]

! colspan="2" | 82659417| Change the Dark Stage 2opponent to [[Yami Bakura (Duel Monsters 4)|Yami Bakura]], except in ''Kaiba Deck''

|45565702* [[Seeker (Duel Monsters 4)|Seeker]]* [[Pandora (Duel Monsters 4)|Pandora]]* Change the Dark Stage opponent to [[Strings (Duel Monsters 4)|Strings]]* [[Isis Marik Ishtar (Duel Monsters 4)|Isis Marik Ishtar]]| [[File:DM4 ST2.png|160px|Stage 2]], except in ''Joey Deck''

! colspan="2" | 18054115| Change the Dark Stage 3opponent to [[Yami Yugi (Duel Monsters 4)|Yami Yugi]], except in ''Yugi Deck''

|19170603* | Change the Secret Stage opponent to [[Maximillion Pegasus Yugi Gonbutori (Duel Monsters 4)|Maximillion Pegasus]]| [[File:DM4 ST3.png|160px|Stage 3Yugi Gonbutori]]

! colspan="2" | 83771069| Change the Secret Stage opponent to [[Kaiser Umiuma (Duel Monsters 4)|Kaiser Umiuma]]

|44220672* [[Mai Valentine (Duel Monsters 4)|Mai Valentine]]* [[Bandit Keith (Duel Monsters 4)|Bandit Keith]]* [[Yami Yugi (Duel Monsters 4)|Yami Yugi]]* [[Yami Bakura (Duel Monsters 4)|Yami Bakura]]* [[Marik Ishtar (Duel Monsters 4)|Marik Ishtar]]| [[File:DM4 ST4.png|160px|Stage 4]]View the credits

===VersusRecords===The records screen contains the player's communication battle statistics, Duelist Level, Deck Volume and statistics for campaign-mode opponents. ===Trade===From the trade menu, the player can trade cards with ''[[Yu-Gi-Oh! Duel Monsters (video game)|Yu-Gi-Oh! Duel Monsters]]'', ''[[Yu-Gi-Oh! Duel Monsters II: Dark duel Stories]]'', ''[[Yu-Gi-Oh! Dark Duel Stories|Yu-Gi-Oh! Duel Monsters III: Tri-Holy God Advent]]'' and other copies of ''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'', using the [[wikipedia:Game Link Cable|Game Link Cable]]. ===Debugging screens===[[File:Shadi-DM4.png|thumb|right|Shadi, when viewed using the debugging menu.]]The debugging screens are unavailable during normal gameplay. They can be enabled by altering the ROM data. When enabled, their options are not visible on screen, but the player can access them by continuing to move the cursor past the campaign or trade options, which are normally the first and last options in the list. The two debugging options are to play a sound or to view a screen.

===Fusion ===Fusions are attempted during Duels by play a card from the [[hand]] on top of a monster on the [[field]] or hand. If successful, the two cards will merge into one. ===Ritual Summon===Since ===Evolution===<nowiki>#</nowiki>278 "[[PolymerizationPetit Moth (DM4)|Petit Moth]]" is not included in this game, Fusions occur differently; selecting one card and placing it its stages evolve into other cards after being on top the field for one turn, in the order shown below. <nowiki>#</nowiki>278 "Petit Moth" → #056 "[[Larvae Moth (DM4)|Larvae Moth]]" → #072 "[[Cocoon of Evolutio (DM4)|Cocoon of another compatible card could result in a fusion for an entirely different Evolutio]]" → #057 "[[Great Moth (DM4)|Great Moth]]" → #067 "[[Monster CardPerfectly Ultimate (DM4)|monsterPerfectly Ultimate]]."

These Fusions are Alignment-based and ===Card effects===Some cards have effects that allow the player to play certain cards, which are reflected as such not in the combination they createtheir Deck. For instance, fusing  {| class="wikitable"|-! scope="col" colspan="2" | Effect! scope="col" colspan="2"| Summoned card|-| 016 || [[Thunder KidTime Wizard (DM4)|Time Wizard]]" with "| 069 || [[Yamatano Thousand Dragon (DM4)|Thousand Dragon Scroll]]" would result in "|-| 117 || [[Thunder DragonSpirit of the Book (DM4)|Spirit of the Book]]". Similarly, combining it with any number of | 486 || [[AquaBoo Koo (DM4)|Boo Koo]] monsters would normally result in "|-| 140 || [[Bolt EscargotToad Master (DM4)|Toad Master]]". Also, combining "| 549 || [[Time WizardFrog The Jam (DM4)|Frog The Jam]]" with "|-| 224 || [[Baby DragonTrap Master (DM4)|Trap Master]]" would result in "| 685 || [[Thousand DragonAcid Trap Hole (DM4)|Acid Trap Hole]]".|}

** [[Black Magic Dark (Alignment)|Shadow]] beats Light** [[White Magic Light (Alignment)|Light]] beats Fiend** [[Demon Magic Fiend (Alignment)|Fiend]] beats Dreams** [[Illusion Magic (Alignment)|Dreams]] beats Shadow** The [[Divine (Alignment)|Divine]] does not automatically beat or lose to any other Alignment

{{Main|''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'' promotional cards}} Three cards were available as pre-order bonuses, with each game having a distinct pre-order bonus. Each copy of the game came with three random promotional cards from a pool of five. Each of the three versions had a separate pool of five cards. Each of the two guide books came with a promotional card. {| class="wikitable"|+ Game promotional cards|-! scope="rowgroup" rowspan="2" | Pre-order! scope="colgroup" colspan="2" |''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Yugi Deckpre-order promotional card|Yugi Deck]]'' ! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Kaiba Deck pre-order promotional card|Kaiba Deck]]''! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Jonouchi Deck pre-order promotional card|Joey Deck]]''|-| G4-01 || "[[Slifer the Sky Dragon (original)|Slifer the Sky Dragon]]"| G4-02 || "[[Obelisk the Tormentor (original)|Obelisk the Tormentor]]"| G4-03 || "[[The Winged Dragon of Ra (original)|The Winged Dragon of Ra]]"|-! scope="rowgroup" rowspan="6" | Bundled! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Yugi Deck promotional cards|Yugi Deck]]''! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Kaiba Deckpromotional cards|Kaiba Deck]]'' promotional cards! scope="colgroup" colspan="2" |''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist: Jonouchi Deckpromotional cards|Joey Deck]]'' |-| G4-04 || "[[Windstorm of Etaqua]]"| G4-05 || "[[Aqua Chorus]]"| G4-06 || "[[Sebek's Blessing]]"|-| G4-07 || "[[Anti-Spell Fragrance]]"| G4-08 || "[[Riryoku]]"| G4-09 || "[[Sword of Dragon's Soul]]"|-| G4-10 || "[[Mesmeric Control]]"| G4-11 || "[[Seal of the Ancients]]"| G4-12 || "[[Negate Attack]]"|-| G4-13 || "[[Gamma The Magnet Warrior]]"| G4-14 || "[[Valkyrion the Magna Warrior]]"| G4-15 || "[[Magical Arm Shield]]"|-| G4-18 || "[[Ring of Destruction]]"| G4-17 || "[[Vorse Raider]]"| G4-16 || "[[Alligator's Sword Dragon]]"|-|} {| class="wikitable"|+ Guide promotional cards}|-! scope="rowgroup" rowspan="2" | Guide! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist Game Guide 1 promotional card|Volume 1]]''! scope="colgroup" colspan="2" | ''[[Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist Game Guide 2 promotional card|Volume 2]]''|-| GB-B1 || "[[Berfomet]]"| GB-B2 || "[[Chimera the Flying Mythical Beast]]"|}

{{Main|''Yu-Gi-Oh! Duel Monsters IV4: Battle of Great Duelist Game Guide 1''|''Yu-Gi-Oh! Duel Monsters IV4: Battle of Great Duelist Game Guide 2''}} == Reception ==''Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist'' sold 2.5 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|20th-best-selling Game Boy/Game Boy Color title]] of all time.

* [http://www.konami.jp/gs/game/yugioh_dm4/index.html Official Japanese website]([https://web.archive.org/web/20061126213420/http://www.konami.jp/gs/game/yugioh_dm4/index.html Web archive])

* [httphttps://www.romhacking.net/games/439/ Romhacking.net ''Kaiba Deck'' page]** [https://datacrystal.romhackingtcrf.net/wiki/Yu-Gi-Oh!_Duel_Monsters_4:_Kaiba_Deck Data Crystal ''Kaiba Deck'' page]* Retro Achievements pages:** ''[https://retroachievements.org/game/14108 Yugi Deck]''** ''[https://retroachievements.org/game/13801 Kaiba Deck]''** ''[https://retroachievements.org/game/14109 Joey Deck]''