WWF Super Wrestlemania

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.