The King of Fighters EX - Gameboy Advance
Unlock Geese:
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Beat the game with the Fatal Fury team and Geese will be unlocked.
Unlock Iori:
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Beat the game with the Hero Team and Iori will be unlocked.
Extra Strikers:
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Successfully complete the game with any team to unlock K',
Maxima and Vanessa at the bottom of the character selection screen.
Alternate costumes:
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When selecting a character, press L (clone costume of your enemy
if you are fighting yourself) or R (different costume).