CheatCodes.com has all the official Yu-Gi-Oh! World Championship 2008 DS cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday May 22, 2013 for Yu-Gi-Oh! World Championship 2008 are shown below.
Beat Jaden Yuki 10 times to unlock the alchemy duel disk.
Complete the Master of Oz Stone Seal Challenge to unlock Tyranno Hassleberry in World Championship mode.
Complete the Exxodd Stone Seal Challenge to unlock Marcel Bonaparte in World Championship mode.
Unlock all GX characters in Single Duel mode to unlock the Blue Uniform.
Unlock all GX characters in Tag Duel mode to unlock the Academy Jersey.
Defeat Joey Wheeler 10 times to unlock the Black Disk.
Complete 6 Stone Seal Challenges to unlock Joey Wheeler in World Championship mode.
Complete the Exodius Stone Seal Challenge to unlock Adrian Gecko in World Championship mode.
Have a total of 400 duels to unlock the Yellow Uniform.
Have a total of 200 duels to unlock the T-Shirt.
Win all five of the Guardian Sphinx's challenges to unlock Maximillion Pegasus in World Championship mode.
Activate spell cards 750 times to unlock Mai Valentine in World Championship mode.
Get a 100% card collection as a girl to unlock the Cyber Tutu costume.
Get a 100% card collection as a boy to unlock the Elemental Hero Neos costume.
To unlock the yellow academy disk, win 10 times in a row.
Use trap cards 500 times to unlock Bakura in World Championship mode.
After beating Sky Guardian Sefolile and you are a boy, you unlock the Celtic Guardian Outfit.
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