Collect specific numbers of stars and crystals to unlock new abilities and levels:
Unlockable - How to Unlock
Bonus: Baseball - 250 crystals
Bonus: Race - 200 crystals
Bonus: Rope - 50 crystals
Bonus: Shooting - 150 crystals
Bonus: Trees - 100 crystals
Jump attack more efficient - 100 Stars
Jump further - 50 Stars
Roll as much as you want - 200 Stars
Tail attack more efficient - 150 Stars
Unlimited boomerangs - 250 Stars