Psychic Force - Platform: Playstation 1

Fight as Keith
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Hold Start + Hard Punch + Light Punch + Guard while the 
character selection screen loads. Alternatively, complete 
the game with all characters without using a continue in 
arcade mode under the "Very Hard" difficulty level 

Make Keith Evans selectable
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To make Keith selectable you have to finish the game in 
story mode on the hardest difficulty with all the characters. 
Once you have done this, Keith becomes selectable in all modes 
but story mode.