When unlocking a costume, select Help & Options from the Main Menu, then select Costumes. The following are listed, though grayed out if not yet unlocked:
Normal - The mice we all know and love; ChuChus!
Pian - Winged creatures from NiGHTS
Chao - Bubbly creatures from Sonic Adventure
When unlocking a difficulty, 25 additional puzzles are unlocked that are arguably more difficult than the previous set.
|Unlockable:||How to unlock:|
|Costume: Chao||Complete all 25 puzzles in Stage Challenge|
|Costume: Pian||Complete every puzzle in Puzzle Mania|
|Puzzle Hard Mode||Complete every puzzle in Puzzle Normal mode|
|Puzzle Mania Mode||Complete every puzzle in Puzzle Special|
|Puzzle Special Mode||Complete every puzzle in Puzzle Hard mode|