Turbo:
Successfully complete the game to unlock the ability to run faster in subsequent games. Hold L during game play to move faster.

Double Jump:
Defeat N. Gin on the Boss stage on the second floor to get the Double Jump.

Super Belly Flop:
Get all the items and you will receive the Super Belly Flop.

Tornado Spin:
Defeat Tiny on the Boss stage on the third floor to get the Tornado Spin.

Bonus level:
Finish the game with a 100% completion. Play again and fight the final Boss. Win the battle to play a level featuring mutated Bosses.