Marvel Super Heroes Cheats (PlayStation)

Note: This code may only work on the Japanese Version of this game. 
  Finish the game and save to the Memory Card. Load the Memory Card then do the Thanos
code in Arcade mode. Quit, then do the Dr.Doom code in Arcade mode. Quit then go to
Arcade mode. Make sure the cursor is on Spiderman then do the following: Up, Right, Down,
Left, Up, Right, Down, Left, press and hold Up then press and hold Jab, Strong, then
Fierce. This will select Anita.

After you win the last round, press SELECT so you can continue to beat your opponent.

After you win the final round, press L + R and you can now still hit the beaten character.

While playing, press Down, Down, Select to taunt your opponent.

Hold SELECT before the match starts.

To play as Thanos, do the following: 
  Beat the game on any difficulty level (you can continue as much as you want). Select
Arcade Mode. Make sure the cursor is on Spiderman (Captain America for Player 2). Press
Up twice (holding up the second time), then immediately press & hold strong punch,
then (while continuing to hold strong punch) press and hold medium punch, then (while
continuing to hold strong punch & medium punch) press and hold weak punch. 
  Thanos's special moves are: 
  Charge: HCF + P (can be done in the air)
  Rock Throw: HCB + K
  Bubble Throw: HCF + K
  Infinity Gauntlet (Infinity Move): QCB, QCB + Any Button (each button gives a different
gem move)

To play as Dr. Doom, do the following: 
  Beat the game on any difficulty level (you can continue as much as you want). Select
Arcade Mode. Make sure the cursor is on Spiderman (Captain America for Player 2). Press
Down twice (holding down the second time), then immediately press and hold weak kick,
then (while continuing to hold weak kick) press and hold medium kick, then (while
continuing to hold weak kick & medium kick), press and hold strong kick. The code
must be done rather quickly so it may take some practice. 
  Dr. Doom's special moves are:
  Energy Beam: QCF + P
  Photon Shot: HCB + P
  Rock Shield: HCB + K
  Photon Array (Infinity Move): QCF + All Punches

When you use a reality gem, press SELECT and your character will throw out pumpkins!

On any character hold Up or Down for three seconds. If the character you want is on the
top row, hold UP. If they're on the bottom row, hold DOWN.