Gussun Oyoyo S Cheats

At the main menu enter the 'option' screen with start while holding: L+R+B and Z. You'll hear a small scream. Keep the buttons pressed and exit the options screen (with A). While still holding the buttons select the main game. A level select screen will show. The Y button can now also be used to skip levels. When above cheat was entered, start a new game while holding X+Y+Z+L+R to enter some kind of debug mode without HUD.

At the main menu highlight the 'game start' option and press A+B+START.
The main character will now wear both a cat and a bunny suit instead of the regular clothing.