Psychic Force
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.