Unlock All Vehicles and Level Select: At the Player Select Screen, enter Y, Z, X, L.

Unlock Kevin Nash: At the Player Select Screen, enter L, X, Z, Y.

Hope I Helped.

Complete season mode with anyone to unlock Vince McMahon

Complete season mode with The Rock, Edge or Kevin Nash to unlock Hulk Hogan

Complete season mode with Brock Lesnar to unlock Bradshaw

Complete season mode with Matt Hardy to unlock Lita

Complete season mode with RVD,The Big Show or HHH to unlock Ric Flair

Complete season mode with Chris Jericho or Edge to unlock Cristian

Complete season mode with Buh Buh Ray Dudley to unlock D-Von Dudley

Complete season mode with Kurt Angle to unlock Stephanie McMahon

To unlock Kevin Nash, press L,X,Z,Y at any menu in the game.

To unlock 'Demolition Derby Mode', complete an arena in season mode without firing ANY weapons AT ALL.(I reccomend being RVD, Jeff Hardy, Matt Hardy or Stacey Kiebler in a Hardcore match because if you use a turbo at the beginning you can get to the belt first and then you need to survive for 30 seconds.)

(By the way, Brock Lesnar is the best on the game because he gets his special quicker than anyone else, and his special is the best because he fires 3
one-hit-kill homing yellow things. He is good on all arena's but he is IDEAL for the Raw arena.)