Master code
Remove the memory card before you activate this code. Then hold L1, then press Right(2x's), Left(2x's), Down, Up, Circle while at the main menu. A message will be spoken to verify proper entry. You can now put the memory card back in and save the game.

Fight as Blob
Finish the game in arcade mode as Bishop to have Blob as a selectable character available.

Fight as Psylocke
Finish the game in arcade mode as Betsy to have Psylocke as a selectable character available.

Fight as Dark Phoenix
Finish the game in arcade mode as Phoenix to have Dark Phoenix as a selectable character available. Or just finish the game in story mode as Magneto.

Fight as Bastion
Finish the game in story mode as Magneto and don't lose any matches to face Bastion. Then beat Bastion to access him as a selectable character.

Fight as Bishop
Finish the game in arcade mode as Gambit to have Bishop as a selectable character available.

Fourth costume
Be the victor in twenty matches in survival mode with every character.

Fifth costume
Finish the game in arcade mode under the hard difficulty setting with every character.

Sixth costume
Beat all ten fighters in time attack mode in less than fifteen minutes to access the sixth costume for the fighter you selected.

Fight as Sentinel A
Finish the game in arcade mode as Cyclops.

Fight as Sentinel B
Be the victor in twenty matches in survival mode.

Third costume
Finish the game in story mode to access that character's third costume.

Eighth costume
Be the victor in forty matches in survival mode as any character.

Seventh costume
First select team mode and choose to fight with eight characters. Then befeat all of the your opponent's team by using two or less of your own fighters to access the seventh costume for the character(s) you used.

Wolverine gets his original yellow/blue/black costume.
Phoenix gets a red/gold costume similar to Dark Phoenix.
Juggernaut, Gambit, and Psylocke get a costume similar to their comic book original.
Beast gets a blue costume with a yellow X on his chest, and he also has a helmet.

When you chose the seventh costume for Cyclops, Wolverine, Betsy, Juggernaut, Sentinel A (Sentinel), Gambit, Storm, Sabretooth, Rogue and Magneto, they will most likely appear in their costumes if they were in a "Vs." series game (Marvel vs. Capcom: Clash Of The Superheroes, X-Men vs. Street Fighter, X-Men Children Of The Atom, Marvel Super Heroes vs. Street Fighter).

Ending sequences
There are three potential endings in the game in story mode.

Regular ending (Magneto's Victory): Defeat Bastion as Magneto.

Alternate ending (Phoenix's Victory): Lose the Magneto vs. Bastion fight and you will go to the Phoenix vs. Bastion fight. Beat Bastion as Phoenix.

Secret Ending (Fury of Dark Phoenix): Get a "Perfect" victory in the Phoenix vs. Bastion fight. This will also, access Dark Phoenix as a playable character.

Hints & Tips

Apocalypse appearance
When your in the Crypt level, fight in the lowest area for a chance to see Apocalypse. His sarcophagus rises out of his tomb and separates, leaving him floating in the air. He laughs, then goes back inside. This is sometimes set off by you fighting well.

Save special move
When you are fighting against Bastion, Sentinel A, or Sentinel B, and they preform a move to put your special on hold, pause the game while playing until the move against you wears off. Now you will be able to use your special without the waste of time.

Nightcrawler: Play in the Dimensional Rage
When you are in training mode as Nightcrawler, turn on "Infinite Specials" then do the Dimensional Rage technique. You will be in the Dimension for the technique. Then do a different special other than Dimensional Rage and make it contact. This will cancel Dimensional Rage and leave you in the darkness. To exit, perform the Dimensional Rage again and let it finish correctly.