The game features a cheat code system accessible via the Options menu, but seemingly none of the codes were ever shared, instead being found by loading "main.dol" into a hex editor when starting at offset 00546F00. The codes in question are:

• "disney fanatic" (unlocking the Fun Pack clothing items)
• "mega star" (unlocking the Wacky Pack clothing items)
• "unlockminigames" (unlocking all the minigames)
• "unlockcawparts" (unlocking all the closet clothing items except the two packs above)
• "unlockall" (unlocking everything except the two packs above)

If the player enters "disney fanatic" or "mega star", a dialogue box will be displayed informing the player that they have unlocked their respective packs. Given that the other codes simply play a chime when entered, it's possible that these two codes were planned for some sort of promotional event that never occurred. Additionally, another code is listed called "unlockmiis", which presumably would have unlocked the ability for players to play as their Mii characters. While the player can still unlock this by entering the "unlockall" code, entering the "unlockmiis" code will act as if it is invalid.