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- Changing the title screen
If you haven't beaten the game, the color of the title screen is normally blue. But after you beat the game, the color switches to purple. You can change it back to blue by pressing Up, Up, Down, Down, Left, Right, Left, Right, B, A at the title screen. Input the same code to change it back to purple.
- Special Duel
Talk with Joey with a time wizard in your deck to unlock a special Duel.
- Special Match
Make an Exodia deck your current deck. Go to the card shop. Talk to Grampa and he will ask you to duel against him using an Exodia deck. Both of the lifepoint scores will start at 10. The only way to win is to get all five pieces of Exodia into your hand. Bringing either players' lifepoints to zero will end the duel in a tie.
- View the ending credits at any time
To do this, you need to beat the game first. Then at any time, press Up, Up, Down, Down, Left, Right, Left, Right, B, A and you'll get to see the credits again.