To get secret characters, go to League Challenge and do the following:

Diamond Dallas Page:
Defeat the heavyweight or cruiser weight division on WCW.

Macho Man Randy Savage:
Defeat the single division on NWO

Wrath:
Defeat the heavy weight or cruiser weight division on DOA.

Glacier:
Defeat the single division on Independent.

Black Widow:
Defeat cruiser weight division on World Wide Wresting.

Joe Bruiser:
Defeat the heavy weight division of World Wide Wrestling.

Pick a wrestler that has the eye gouge move (such as Erik Bischoff) and do it repeatedly. Sooner or later the masked wrestler will be unmasked.

To execute one of your opponent's moves, get your opponent in a strong grapple (hold down A) when your Spirit Meter is flashing "SPECIAL", and press A + B simultaneously.

While playing against the computer, pull them out of the ring on either the left or right side, and while they are down run across to the opposite side and climb on the outer edge of the ring....If they are directly across from you when you do this, they will not come after you or try to get back in the ring and you will get a sure COUNTOUT on EVERY MATCH! (You can beat your opponents in under 50 seconds every time if done right away).

Go outside the ring, press towards the gate and the C-Up button.
Only certain wrestlers can get weapons from the audience.

If you are in a pin or a submission hold press the toggle button (analog stick) in one direction several times and you will break out. It works best for pin moves. Be warned - your wrestler may take the full amount of damage that the hold or move can dish out.

When you get knocked down, hold down the joystick to stay down. Then just get up whenever you want. This works well to take your opponent by surprise.

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