X-Men - Next Dimension - Platform: Gamecube
      
Unlock everything:
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At the main menu, press 
Up, Up, Down, Down, Left, Right, Left, Right, A, B, Start, Start. 

Toggle One hit kills:
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At the main menu, press Up, Up, Down, Down, X, Y, Y, X. 

Toggle AI:
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At the main manu, press Up, Up, Down, Down, A, A, B, B, X, X, Y, Y. 

Toggle Unlimited Supers:
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At the main menu, press Up, Up, Down, Down, A, X, A, X.

Master code:
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Press Up(2), Down(2), Left, Right, Left, Right, A, B, Start(2) at the 
main menu. A message will confirm correct code entry. 

One hit kills:
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Press Up(2), Down(2), X, Y, Y, X at the main menu. A message will 
confirm correct code entry. Repeat the code for slow deaths. 

Toggle unlimited supers:
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Press Up(2), Down(2), A, X, A, X at the main menu. 
A message will confirm correct code entry. 

Toggle AI:
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Press Up(2), Down(2), A(2), B(2), X(2), Y(2) at the main menu. 
A message will confirm correct code entry. 

Fight as Bastion:
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Successfully complete the game story mode as Magneto without losing 
any matches to face Bastion. Defeat Bastion to unlock him as a 
selectable character. 

Fight as Bishop:
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Successfully complete the game in arcade mode as Gambit to 
unlock Bishop as a selectable character. 

Fight as Blob:
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Successfully complete the game in arcade mode as Bishop to 
unlock Blob as a selectable character. 

Fight as Psylocke
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Successfully complete the game in arcade mode as Betsy to 
unlock Psylocke as a selectable character. 

Fight as Dark Phoenix
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Successfully complete the game in arcade mode as Phoenix to 
unlock Dark Phoenix as a selectable character. Alternately, 
successfully complete the game in story mode as Magneto. 

Fight as Pyro
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Successfully complete the game in arcade mode as Dark Phoenix 
under the easy, medium, and expert difficulty settings to unlock 
Pyro as a selectable character. 

Fight as Sentinel A
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Successfully complete the game in arcade mode as Cyclops. 

Fight as Sentinel B
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Win twenty matches in survival mode. 

Third costume
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Successfully complete the game in story mode to unlock that 
character's third costume. 

Fourth costume
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Win twenty matches in survival mode with all characters. 

Fifth costume
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Successfully complete the game in arcade mode under the hard 
difficulty setting with all characters. 

Sixth costume
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Defeat all ten fighters in time attack mode in under fifteen 
minutes to unlock the sixth costume for the fighter you selected. 

Seventh costume
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Select team mode and choose to fight with eight characters. 
Defeat all of the your opponent's team by using two or less of 
your own fighters to unlock 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 commonly 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).

Eighth costume
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Win forty matches in survival mode as any character. 

Classic costumes
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Some characters have classic outfits that resemble 
the classic X-Men characters:

Wolverine: Costume VII
Betsy: Costume VII
Forge: Costume VI
Gambit: Costume V
Juggernaut: Costume VII
Magneto: Costume VII
Nightcrawler: Costume VII
Sabretooth: Costume III
Rogue: Costume VI 

Ending sequences
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There are three possible 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. Defeat Bastion as Phoenix. 
Secret Ending (Fury of Dark Phoenix): Get a "Perfect" victory in the Phoenix 
vs. Bastion fight. This will also, unlock Dark Phoenix as a playable character. 

Nightcrawler: Play in the Dimensional Rage
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When in training mode as Nightcrawler, turn on "Infinite Specials" then perform 
the Dimensional Rage technique. You will be in the Dimension for the technique. 
Perform 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 properly.