SNK vs. Capcom - SVC Chaos - Platform: XBox

Play as Dan:
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At the title screen, hold Start and press Down, Left(7), then any button to 
unlock Dan.

Play as Demitri:
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At the title screen, hold Start and press Right(3), Left, Up, Right, Down, Up, 
then any button to unlock Demitri.

Play as Evil Iori:
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At the title screen, hold Start and press Up(3), Down, Left, Right, Down, Left 
to unlock Evil Iori.

Play as Geese:
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At the title screen, hold Start and press Left(3), Down, Left, Up, Right, Up to 
unlock Geese.

Play as Goenitz:
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At the title screen, hold Start and press Down(3), Right, Down, Left(3) to 
unlock Goenitz.

Play as Mars Alien:
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At the title screen, hold Start and press Up, Down, Right(3), Up, Down, Left(2), 
Down, then any button to unlock Mars Alien.

Play as Red Demon:
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Enter survival mode. Defeat the opponents until you face the Red Demon. Defeat 
him to unlock him as a selectable character in all modes. To choose the Red 
Demon, highlight Tabasa at the character selection screen, then hold R and press 
X, Y, A or B. Note: The Red Demon is one of the best fighters in the game.

Play as Shin Mr.Karate:
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At the character selection screen, highlight Kasumi, then hold R.

Play as Super Akuma/Shin Gouki:
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At the character selection screen, highlight Balrog, then hold R.

Play as Violent Ken:
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At the title screen, hold Start and press Up(2), Down, Left(2), Right, Left, Up, 
then any button to unlock Violent Ken.

Play as Young Athena:
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Enter survival mode. Defeat the opponents until you face Athena. Defeat her to 
unlock her as a selectable character in all modes. To choose Young Athena, 
highlight Genjuro at the character selection screen, then hold R and press X, Y, 
A or B. Note: Athena is one of the best fighters in the game.