Unlock single set of wrestlers
At the title screen, press R, L, C-Right, C-Left(2), C-Right, L, R, Z. If you entered the code correctly, you will hear a sound. Then, highlight a wrestler at the character selection screen and press C-Left, C-Right, L, R, C-Left, C-Right, L, R, Z. All three hidden wrestlers related to that wrestler will now be unlocked.

All wrestlers
At the title screen, press C-Right(4), C-Left(4), R(4), L(4), Z to unlock all forty-eight bonus wrestlers in the game. If you entered the code correctly, you will hear a sound.

All rings
At the title screen, press C-Left, L, C-Right, R, C-Left, L, C-Right, R, Z. If you entered the code correctly, you will hear a sound. Then The Graveyard, Spaceship, Circus, Hive, Turbo, Wunderland, Boudoir, Hall of Mirrors, Reck Room, Psychodelic, Disco, Jungle, 1984, Quark, and Texas rings will be selectable.

Ring select
At the options screen, press C-Right, R, C-Right, R, Z. If you entered the code correctly, you will hear a sound. Then, every time Z is pressed, the current ring will advance to the next in the series. To move in reverse, press C-Left, L, C-Left, L followed by Z.

Swelling heads
At the title screen, press C-Left(7), L, Z. If you entered the code correctly, you will hear a sound. Then the head of each wrestler will swell with each hit.

Big head mode
At the title screen, press C-Right(7), R, Z. If you entered the code correctly, you will hear a sound.

Giant head mode
At the title screen, press C-Right(4), C-Left, C-Right, C-Left, C-Right, Z. If you entered the code correctly, you will hear a sound.

Big heads, hands, feet
At the title screen, press R(7), C-Right, Z. If you entered the code correctly, you will hear a sound.

Big hands
At the mode selection screen, press L(7), C-Left(17).