Activate a secret code

Listen to the whole inventory song

Receive the Bell

Complete tutorial

Play in co-op

Overcome a hill or a bridge. No boosters, no bubbles

Chew some bubble gum (co-op only)

Break down a car before a race (co-op only)

Leave a race right after a crash

Collect 1000 mushrooms from totems

Collect 1000 rainy mushrooms

Overcome 5 obstacles in a raw in a bubble