We have 1 cheats and tips on GameBoy. If you have any cheats or tips for Yu-Gi-Oh! Duel Monsters 4 please send them in here. You can also ask your question on our Yu-Gi-Oh! Duel Monsters 4 Questions & Answers page.
Enter the following codes to unlock the corresponding effect
77568553 - Acid Crawler
41356845 - Acid Trap Hole
08353769 - Air Eater
75889523 - Air Marmot of Nefariousness
38035986 - Akekiesu
36904469 - Akihiron
64428736 - Alligator' Sword
03366982 - Alligator' Sword Dragon
99785935 - Alpha The Magnet Warrior
17968114 - Amazon of the Sea
95174353 - Ameba
40173854 - Amphibious Bugroth
93221206 - Ancient Elf
81492226 - Ancient Jar
43230671 - Ancient Lizard Warrior
14015067 - Ancient of the Deep Forest
49587396 - Ancient Tool
42431843 - Anicent Brain
48365709 - Ansatsu
89904598 - Anthrosaurus
42364257 - Anti Raigeki
86164529 - Aqua Dragon
85639257 - Aqua Madoor
14708569 - Arlownay
36151751 - Arma Knight
53153481 - Armaill
09076207 - Armed Ninja
15480588 - Armored Lizard
16246527 - Armored Rat
17535588 - Armored Starfish
20277860 - Armored Zombie
40619825 - Axe of Despair
48305365 - Axe Raider
61528025 - Banisher of the Light
06840573 - Barox
81480460 - Barrel Dragon
67841515 - Barrel Lily
10476868 - Barrel Rock
89091579 - Basic Insect
05053103 - Battle Ox
18246479 - Battle Steer
55550921 - Battle Warrior
84990171 - Bean Soldier
46009906 - Beast Fangs
99426834 - Beastking of the Swamps
16899564 - Beautiful Headhuntress
32452818 - Beaver Warrior
94022093 - Behegon
39256679 - Beta The Magnet Warrior
25655502 - Bickuribox
16768387 - Big Eye
53606874 - Big Insect
65240384 - Big Shield Gardna
08058240 - Binding Chain
07670542 - Bio Plant
41426869 - Black Illusion Ritual
65169794 - Black Pendant
87564352 - Blackland Fire Dragon
28470714 - Bladefly
70138455 - Blast Juggler
26302522 - Blast Sphere
53183600 - Blue Eyes Toon Dragon
35282433 - Blue-Eyed Silver Zombie
89631139 - Blue-Eyes White Dragon
41396436 - Blue-Winged Crown
21340051 - Boar Soldier
12146024 - Bolt Escargot
91595718 - Book of Secret Arts
81386177 - Bottom Dweller
20101223 - Breath of Light
82878489 - Bright Castle
06297941 - Burglar
78193831 - Buster Blader
47695416 - Candle of Fate
11384280 - Cannon Soldier
00062121 - Castle of Dark Illusions
95727991 - Catapult Turtle
20228463 - Ceremonial Bell
04031928 - Change of Heart
37421579 - Charubin the Fire Knight
41218256 - Claw Reacher
92667214 - Clown Zombie
93889755 - Cockroach Knight
33413638 - Crass Clown
67494157 - Crawling Dragon
53713014 - Crazy Fish
46696593 - Crimson Sunbird
77998771 - Crow Goblin
57728570 - Crush Card
28279543 - Curse of Dragon
22026707 - Curtain of the Dark Ones
06400512 - Cyber Commander
30655537 - Cyber Falcon
34124316 - Cyber Jar
89112729 - Cyber Saurus
63224564 - Cyber Shield
44865098 - Cyber Soldier
48766543 - Cyber Tech Alligator
69015963 - Cyber-Stein
59983499 - Dancing Elf
72520073 - Dark Artist
41949033 - Dark Assailant
32344688 - Dark Chimera
21417692 - Dark Elf