Put Yu-Gi-Oh!GX Duel Academy into the GBA Slot of the Nintendo DS. Start Yu-Gi-Oh! Nightmare Troubadour and 3 Wing Koriboh cards will unlock.

Insert the code 00003750 at the KC Card Shop to view the game’s end credits, as well as a minigame.

Insert the code 57300000 at the KC Card Shop to view the in-game music gallery.