300 Hit Combos:

 First perform any Combo. When your  opponent's  life meter  turns red,
 execute one of your character's Special Moves.  Many hits will follow,
 and you can still do your character's Claytality! 

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Alternate Colors:

 To choose your clay fighter's  alternate color, press C-Down to select
 your character. 

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Level Select:

 In the two-player mode, when the versus screen comes up, press C-Right
 or C-Left to change the stage you will fight in. 

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Play as Boogerman:

 To play as Boogerman, go to the Character  Select  screen, then hold L
 and  press  Up, Right, Down, Left, Right, Left on the  d-pad  (not the
 analog stick.) 

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Play as Dr. Kiln:

 To play as Dr. Kiln go to the player select  screen and press and hold
 the L button, press B, left C, up C, right C, down C, A.  There should
 be a flash on the screen. 

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Play as Sumo Santa:

 At the Character  Select  screen, hold L and press A, C-Down, C-Right,
 C-Up, C-Left, B. 

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Random Character Selection:

 At the character  selection  screen, hold L & R buttons simultaneously
 and a random clay fighter will be chosen for you. 

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Secret Options:

 At the Character Select  screen, hold L & press C-Up, C-Right, C-Left,
 C-Down, B, A, A. A flash of light will confirm the code.

 Then go to the  option  menu  and you will see a new  menu  for Secret
 Options.  Now  you  can  choose  itty  bitty/massive  bodies, high/low
 voices, background select, and a few other options. 

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Taunts:

 To taunt your  opponent, enter one of the  codes  below. (Depending on
 your character, of course.)

 Bad Mr. Frosty: L, R + B simultaneously or L, R + A simultaneously.
 Blob: L, R + A simultaneously.
 Bonker: L, R + A simultaneously.
 Dr. Kiln: L, R + A simultaneously.
 Earthworm Jim: L, R + A simultaneously.
 Houngan: L, R + B simultaneously or L, R + A simultaneously.
 Icky Bod Clay: L, R + B simultaneously.
 Kung Pow: L, R + A simultaneously.
 Sumo Santa: L, R + A simultaneously.
 Taffy: L, R + B simultaneously.
 T. Hoppy: L, R + A simultaneously.