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From the setup menu, choose cheat codes then enter the code
All Boxers: Start, R1, X, O, Square, R1, R1, R1, Start
Conversation Mode
Entry Location:
From the setup menu, choose cheat codes then enter the code

Start, X, O, Square, Square, R1, R1, Square, O, X, Start


Double Speed
Entry Location:
From the setup menu, choose cheat codes then enter the code

Start, R1 x10, Start


Intercontinental Mode
Entry Location:
From the setup menu, choose cheat codes then enter the code

Start, X, X, X, O, O, O, Square, Square, Square, Start


Scrap-Yard Scene
Entry Location:
From the setup menu, choose cheat codes then enter the code

Start, O, R1, O, R1, X, X, Start


Second Skin
Entry Location:
From the setup menu, choose cheat codes then enter the code

Start, X, R1, O, Square, Start