Go to the character selection screen and type in "I WOULD RATHER BE WATCHING FOREST". Press the 'Space' bar. Choose your character. When the level has loaded, press 'Esc' to find yourself whisked away to the main menu. At the bottom it should say "Cheat Mode Active All". Now go down to "Option" and press 'Right' on your control pad. This will spring you into the level select menu, allowing you to twiddle the selections. Once you've selected a level, go to the 1 or 2 player game and enjoy.