Unbreakable Weapons
At the Main Menu enter:

L, R, L, R, C-LEFT, C-LEFT

Super High Stamina
At the Main Menu enter:

R, L, R, L, B, B

New Wrestler Sounds
At the Main Menu enter:

R, R, B, R, R, B.

Tiny Wrestlers
At the Main Menu enter:

R, R, L, L, C-LEFT, C-LEFT

Massive Women Wrestlers
At the Main Menu enter:

R, R, B, B, L, L.