All Wrestlers:
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.

Swelling Head:
At the Select Mode screen, enter SPACE 7 times, T, H

Ring Skip:
At the Options Menu, press V, Q, V, Q, H. Each time you press H, the ring will advance by one.

Ring Select:
At the Main Menu, press SPACE, T, V, Q 4 times, then press H.

Secret Rings:
At the Main Menu, press SPACE, T, V, Q, SPACE, T, V, Q, and H. Now you have the secret rings.

Instant Win:
Highlight a wrestler at the Character Select screen and press SPACE, V, T, Q, SPACE, V, T, Q, and H.

YMCA:
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!

Thanks to Revolution readers Adam Koenigsberg, The_Hydester, Johnny M, Kane, Xpac21 44, Roaddogg, John, Matthew Swoboda, Josh Temple, Jesse Seymour, The_Hydester, Dirck James, Kevin Nash, and Tony Sink!