After collecting all 44 entry passes, you can have a 4-player game. To do this, have a 2-player game then add controllers to sockets 3 and/or 4. When in the game, press Right-C and Start on controller 3 and/or 4 and an extra player will appear!
Complete the final castle and obtain all forty-four Entry Passes. You will now be able to buy alternative costumes for each of the four characters at specific stores. These include a turban'd ''Arabian Nights'' costume, and a maid outfit.
At the game over screen, push try again and then tap A rapidly to make the hula hoop go faster.
When starting a game on a perfect save file, you can choose which of the costumes (that you've already purchased) your character should start wearing, by highlighting them and pushing up or down on either the analogue stick or + shaped control pad.