Secret options mode
At the character selection screen, hold L and press C-Up, C-Right, C-Left, C-Down, B, A(2). If you entered the code correctly, the screen will flash. Press B to exit, then enter the options menu. Choose the "Secret Options" selection to access different body sizes, voices, backgrounds, camera flights, claytality timer settings, and camera control using controller four.

Play as Sumo Santa
At the character selection screen, hold L and press A, C-Down, C-Right, C-Up, C-Left, B.

Play as Dr. Kiln
At the character selection screen, hold L and press B, C-Left, C-Up, C-Right, C-Down, A.

Play as Boogerman
At the character selection screen, hold L and press Up, Right, Down, Left, Right, Left.

CPU control
At the character selection screen, hold L and press A(5), C-Up, C-Down, C-Left, C-Left, B, A, C-Right.

Programmer's mode
At the character selection screen, hold L and press A, B, A, B, A, B, C-Left, C-Right, C-Up, C-Right, C-Left, C-Right. This mode allows any character to be selected, and has an overhead view of each stage.

Random fighter select
At the character selection screen, hold L + R.

Alternate costume colors
At the character selection screen, press A for color scheme one or C-Down for color scheme two, then press B to exit.

Same costume colors
At the character selection screen, press C-Up on either controller to select any fighter. Then, have the other player highlight the same character and allow the timer to reach zero. Both fighters will now be the same color during the match.

Stage select
Select two player mode, then press C-Left or C-Right at the screen that displays the current stage.