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Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist

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Title Screen

Yu-Gi-Oh! Duel Monsters 4: Battle of Great Duelist Jonouchi, Kaiba, and Yuugi Decks

Developer: Konami Computer Entertainment Japan
Publisher: Konami
Platform: Game Boy Color
Released in JP: December 7, 2000

DebugIcon.png This game has debugging material.
SoundtestIcon.png This game has a hidden sound test.

This came out only five months after the previous game and has not one, but three different versions.

Debug Menus

The two debugging menus function similarly to the previous entries. To access these in any of the three versions, use the Game Genie codes 064-16B-F7A and 074-00B-F7E, or modify offset 0x10400 to 07 and offset 0x10416 to 06 in the ROM.

Sound Test

Yes, it's copied directly from Dark Duel Stories. Yes, it is virtually the same thing.

Choose to listen to either the songs (きょく) or sound effects (おと). Music goes up to 34, while sound goes up to 25. The only controls are A to play a song, and B to exit back to the menu.

Character Animation Viewer

This isn't, but it looks the same as the JP version of DDS.

View all of the opponents' cutscene animations, which can be viewed by pressing A. The index only goes up to 23. Anything higher and the game sends the player back to the menu. However, no matter who is selected, some random digits are printed onto the screen as placeholder dialogue.

(Source: Mezmorize)

Build Date

« 00 08 02 !KONAMI »

This string, present at 0x11367 is written to the save file upon creation. When loading a save file, the game looks for the string to determine if save data exists.

Secret Characters

Two secret opponents can be unlocked after clearing the final stage, by using the following passwords:

Password Character Image
83771069 Kaiser Umiuma Yu-Gi-Oh! DM4 Kaiser Umiuma.png
19170603 Yugi Gonbutori Yu-Gi-Oh! DM4 Yugi Gonbutori.png