Bonus Level  Collect all the crowns from all levels and beat the bosses. (Thanks to LWargalla@t-online.de)

Bonus Round  At stage 6 in the first room, go to the place near the rabbit, get the crown, and open the locked door (must have 50 crowns or more). (Thanks to LWargalla@t-online.de)

Hidden Suprise  Collect 20 crowns on every level.  Enter the "?" on the level select menu.  This will take you to the bosses without fighting the rest of the level.

Play Pool  On Stage 6, don't go upstairs in the first room. Instead, go to the place with the rabbit. Get the crown near the door, and open the door. Go in the room to play pool (you need at least 50 crowns). (Thanks to IBARRASNSD@prodigy.net)

Refill Health  When you're almost out of life, save your game by pressing Start and selecting save. Then, press Start and select Exit. Then, load the game you just saved. (Thanks to Myau84@aol.com)