Dancing wrestlers

First, enter the code to unlock all rings (L1,L2,R1,R2,L1,L2,R1,R2,select) then choose "USO" ring and the wrestlers will perform dance moves when their basic button moves are pressed!!! 

Secret Wrestlers

This code is for wcw-nwo thunder. At the character select screen press R1(4 times) L1 (4 times) R2 ( 4 times) R2(4) L2(4) and hit select.. you should hear a noise and then you get all 96 hidden wrestlers.

Simple extra setting for Weapons

Set the ring on Turbo at the wepons feature you will have an extra setting for tons. 

Bonus Wrestlers:
To unlock the bonus wrestlers, Press R1,R1,R1,R1,L1,L1,L1,L1, R2, R2, R2,
R2, L2, L2, L2,
L2, SELECT at the title screen.

Big Heads:
At the title screen press R1, R1, R1, R1, R1, R1, R1, R2, Select.

Submitted by David

Big Head, Hands, Feet, and Weapons:
At the title screen press R2, R2, R2, R2, R2, R2, R2, R1, Select.

Submitted by David

Might Meter:
At the title screen press L2, L2, L2, L2, R2, R2, R2, R2, L1, L1, L1, L1,
R1, R1, R1, R1,
Select. You can now adjust the offensive and defensive attributes of each
wrestler.

Submitted by David

Ring Select:
At the options menu press R1, R2, R1, R2, Select. NOTE: Each time Select is
pressed, the
current ring will advance by one, to move in reverse, press L1, L2, L1, L2
followed by Select.