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Playstation - Hard Boiled cheats

Select any stage:
Hold Up + X + Start buttons and choose the "Load Game" option at 
the text credits opening screen.

Fight stage 2 Boss
Activate the "Select any stage" code. Then, hold the L1 button  during 
the "Loading" screen. 

Fight stage 5 Boss
Enable the "Select any stage" code. Then, hold the R1 button during 
the "Loading" screen.