The King of Fighters Evolution - Platform: Dreamcast

Enable Dark Strikers 
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After buying Level 1 Justice Fio and Alfred, they become enabled. 

Enable Justice Fio and Justice Alfred 
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Simply buy all of the Level 1 Justice Strikers, and these two will 
be enabled. 

Enable Syo and Gai 
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In order to enable these two secret strikers,You have to play the 
game for 50 hours.They will apppear in the extra strikers menu. 

Enable Dark Fio and Dark Alfred 
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Simply buy all of the Level 1 Dark Strikers, and these two will 
be enabled. 

Full pause screen
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Pause game play and press X + Y.