Complete these objectives to unlock additional character skins.

Character	How to unlock
Astronaut	Collect 10 crates on Moon Temple (normal)
Billy	Collect 100 crates (normal, any stage)
Chicken	Collect 50 crates (SFMT mode, any stage)
Crocodile	Collect 25 crates on Construction Yard (normal)
Ninja	Collect 20 crates in Ambush mode (any stage)
Piklupu	Collect 35 crates on Moon Temple (normal)
Robot	Collect 30 crates on Rocket Silo (normal)