Ant Mode
Press down 10 times during the screen before the fight while the
players are talking to each other.
Brawly vs. Goku
To play as Brawly vs. Son Goku in the versus match, press Up,
X, Down, B, L, Y, R, A during
the intro where you see Son Goku's hand's flying toward the tower
in the sky.
Surrender
Hold Y + X + B + A then hit Select during any match and your character
will surrender.
Turbo Mode
At the beginning of the game, right before Gokou starts speaking
in black screen, quickly push the L and R buttons on the second
player controller. If you did the code right, the "2"
in the title screenwill be flashing. The slower it flashes, the
faster the game will be.