Feel the Magic: XY/XX/Extras

GBA SEGA Carts
By inserting a SEGA GBA game cart into the DS whilst playing Feel the Magic will unlock extra outfits in Maniac mode. And trust me these outfits are worth having! Don't worry if you don't have all of these games, I doubt it everyone will have them all anyway! but you can unlock them elsewhere, but you'll have to go the long way round and complete Story Hell mode. The GBA unlockables are:

Sonic Advance Sonic Advance 2 Sonic Advance 3 Sonic Pinball Party Sonic Battle ChuChu Rocket Puyo Pop Space Channel 5: Ulala's Cosmic Attack