Cotton 2 Cheats

At the title screen, select the option screen menu. Now press and hold ABCXYZ buttons at the same time (press A a split second before the others). You should now be in the option screen with some additional choices.

This will let you select Appli and Cotton as player 1 or 2, access music test, and even has some control options for XYZ buttons, including rapid fire or single button moves!

Back on the main menu there should be a Training menu as well.