Random character:
Highlight Doink with controller one and Razor Ramon with controller two at the character selection screen. Press Up + Start to be assigned a random character.

Unlimited combos:
Pause game play and press B, A, Down, B, Up, Left(2). Both characters may execute unlimited combos.

Mayhem moves:

Bam Bam Bigelow's Pogo Piledriver
From a headlock, Press Down(2), C for one slam, then repeatedly press Z for up to four hits.

Doink's Joybuzzer
Hold A for approximately three seconds and then release.

Bret Hart's Sharpshooter
Hold Z at the feet of a fallen opponent.

Lex Luger's Medevil Mase Smash
Press Towards(2), C, then repeatedly press A for up to four hits.

Shawn Michaels' Frankensteiner
Press Towards(2), C. Alternately, get your opponent in a headlock and press Towards(2), Z.

Razor Ramon's Rug Slam
Repeatedly press C at the feet of a fallen opponent. Alternately, get your opponent in a headlock and press Down(2), A.

The Undertaker's Demon's
Press Down, Towards, A or Z.

Yokozuna's Rag Doll Slam
Lift your opponent above your head and press Down + C to swing your opponent by the hair. Note: Despite the fact Bam Bam Bigelow has no hair, this move still works.

Bret Hart: Sharp Shooter:
Go near your opponent's legs and press A + Start then keep pressing Start.

Razor Ramon: Special move:
Go near your opponent's legs and press A + Start and repeat.

Undertaker: Special move:
Press Down, Left or Right (where your opponent is standing ) then press A. The Undertaker will do a special move.