Deadly Arts - Platform: Nintendo64

Fight as Gouriki
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Press Up, Up, Down, Down, Left, Right, Left, Right, B, A 
at the title screen. 

Fight as Reiji
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Press A, B, Right, Left, Right, Left, Down, Down, Up, Up 
at the title screen. 

Alternate costumes
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Hold L and press Left or Right at the character selection 
screen. The character portrait will change colors to confirm 
correct code entry. Then, select a character while L is still 
held. 

Special stage
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Break down all ten buildings in a single stage. Return to 
the stage selection screen and press Start.