Champion costumes
Complete the game in championship mode with a to unlock their champion costume.

Fight as Freak E. Deke
Complete the game in arcade mode once to unlock Freak E. Deke.

Fight as Michael Jackson
Complete the game in arcade mode twice to unlock Michael Jackson.

G. C. Thunder:
Complete the game in arcade mode three times to unlock G. C. Thunder.

Wild "Stubby" Corley:
Complete the game in arcade mode four times to unlock Wild "Stubby" Corley.

Shaquille O'Neal:
Complete the game in arcade mode five times to unlock Shaquille O'Neal

Freedom Brock:
Complete the game in arcade mode six times to unlock Freedom Brock.

Rocket Samchay:
Complete the game in arcade mode seven times to unlock Rocket Samchay.

Robox Rese-4:
Complete the game in arcade mode eight times to unlock Robox Rese-4.

Bill Clinton:
Complete the game in arcade mode nine times to unlock Bill Clinton.

Hillary Clinton:
Complete the game in arcade mode ten times to unlock Hillary Clinton.

Hidden Costumes:
Set the system dates to those shown to unlock themed costumes for the specified character:
New Year's Costume (Joey T) - January 1
St. Patrick's Day costume (Referee) - March 17
Valentine's Day costume (Lulu) - February 14
Easter costume (Mama Tua) - April 23 01
Independence Day costume (G.C. Thunder) - July 4
Halloween costume (J.R. FLurry) - October 31
Christmas costume (Rumbleman) - December 25