Clear areas and earn stars to unlock new areas and abilities.

Unlockable	How to unlock
Unlock Berserk	Clear area I.
Unlock Nightmare area	Clear area IV.
Unlock Nightmare course 1	Collect at least 80 stars from area I.
Unlock Nightmare course 2	Collect at least 80 stars from area II.
Unlock Nightmare course 3	Collect at least 80 stars from area III.
Unlock Nightmare course 4	Collect at least 80 stars from area IV.
Unlock Nightmare course 5	Collect at least 26 stars from Nightmare courses 1-4.
Unlock Speedster	Clear area II.
Unlock Time Records	Clear area II.
Unlock Uncle Time	Clear area III.