Finish a level without utilizing a continue to unlock three bonus levels for that difficulty.
Beginner level 2: Warp To level 5:
Instead of going forwards towards the goal, turn around and go up the little point. Fall off and land on a platform beneath. There should be another goal there that warps you to level 5.
Monkey Fight: Super Power-ups:
You can combine the power ups to create combos:
Big Glove + Big Glove = Double Glove
Big Glove + Long = Big, Long Glove
Big Glove + Vortex = Big, Vortex Glove
Big Glove + Big Glove + Long = Super Big, Long Glove
Big Glove + Big Glove + Vortex = Super Big, Vortex Glove