Collect all the crowns and bosses of all 6 levels and a new level will be available.
Bonus Round
Go to Stage 6. In the first room, pass the stairs and go near where the rabbit, crown and locked door are. Go through the locked door and you will get to play a round of pool.
Fight Bosses
Collect at least 20 crowns in all six stages. A box with a question mark in it should appear over Stage 1. If you choose it, you will be able to play any of the bosses without playing through their respective stages first.
