Red Dog: Superior Fire Power (Dreamcast)
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Drive or Die Expert Multiplayer Level
At the Level Selection screen, highlight Drive or Die Expert Multiplayer Level and hold L + R for 3 seconds.
Helter Skelter Multiplayer Level
Play 20 or more multiplayer games without turning the system off. Then change your options to make the game save.
Hidden artwork
Place the game disc in a PC compatible CD-ROM drive to find artwork from the game.