At the title screen, enter the following on the directional pad:
Up, Up, Down, Down, Left, Right, Left, Right, B, A
10/6/2000
Play as Reiji
At the title screen, enter the following on the directional pad:
A, B, Right, Left, Right, Left, Down, Down, Up, Up
7/13/2002
Alternate costumes
Hold L and press Left or Right at the character selection screen. The character portrait will change colors to confirm correct code entry. Then, select a character while L is still held.
12/7/2002
Revive health
Press C-Up, C-Down, C-Left, or C-Right to give you 2 health points after you lose them.
11/18/2003
Extra create a character bodies.
Create a character and train your character untill he/she learns 90 moves. Once you get that you will have two new bodies for both male and female when you create another character.
6/30/2004
Secret stage
Break all 10 buildings in a single stage, then return to stage selection and press Start. You can also complete the game in tag team mode under very easy difficulty using one character in under 21 minutes.