Feel the Magic: XY/XX
Body 2 and 3
Successfully complete story mode on the normal difficulty setting to unlock Body 2 and 3.
Carts level
Look on the top screen to see which lane the person is flying down. Then, pay close attention and firmly stroke a straight line down the path the man in the cart will soon come through. Every spike-ball will move just enough for the cart to get by. This level is otherwise nearly impossible to complete.
Chao hairstyle
Have Sonic Advance 3 inserted into the GBA slot.
Chao hairstyle/NiGHTS Wig/Sonic Wig/Ulala hairstyles
Beat hell mode.
Costumes in Maniac mode
Complete the indicated tasks to unlock the corresponding costume.
Angel's costume and wings: Find 182 stars and 60 rabbits.
Blue and white dress: Find 75 stars.
Blue and white schoolgirl uniform: Find 20 stars.
Blue chicken outfit: Find 100 stars and 35 rabbits.
Blue polo shirt and white skirt: Find 15 stars.
Cheerleader uniform: Find 10 stars.
Cowgirl outfit: Complete hard mode.
Green and white armor: Find 170 stars and 55 rabbits.
Green schoolgirl outfit: Find 182 stars.
Green top and brown shorts: Find 30 stars.
Gray and white dress: Find 100 stars.
Nude: Complete Hell mode.
Orange and white dress: Find 130 stars.
Pink dress: Complete Normal mode.
Pink top and bunny tail shorts: Find 50 stars.
Police uniform: Find 130 stars and 40 rabbits.
Red and white Christmas outfit: Complete Hard mode.
Red swimming costume: Find 170 stars.
White bikini and denim hotpants: Complete Normal mode.
White nurse uniform: Find 100 stars and 30 rabbits.