At Character Select screen, press V 4 times, SPACE 4 times, Q 4 times, and T 4 times. Then press H to open up all the characters.
Big Head Mode
At the Select Mode screen, enter V 7 times, Q, H.
Big Head, Hands, Feet
At the Select Mode screen, enter Q 7 times, V, H.
Instant Win
Highlight a wrestler at the Character Select screen and press SPACE, V, T, Q, SPACE, V, T, Q, and H.
Ring Select
At the Main Menu, press SPACE, T, V, Q 4 times, then press H.
Ring Skip
At the Options Menu, press V, Q, V, Q, H. Each time you press H, the ring will advance by one.
Secret Rings
At the Main Menu, press SPACE, T, V, Q, SPACE, T, V, Q, and H. Now you have the secret rings.
Swelling Head
At the Select Mode screen, enter SPACE 7 times, T, H
Ymca Dance
While playing in the Disco ring, throw your opponent out of the ring. Hit T and the wrestlers will do the YMCA. If you do it long enough, the wrestler will get counted out and you will win!
All Wrestlers...