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Nintendo 64 - Cruis'n USA cheats

Unlock Golden Gate Park track
Hold L + C-Left + C-Down  at the track selection screen.

Unlock San Francisco track
Hold L + C-Right + C-Down  at the track selection screen.

Indiana track
Hold L + C-Right + C-Up at the track selection screen.

Bonus vehicles - All Terrain Vehicle, School Bus and Police Car:
Hold C-Up + C-Left + C-Down at the car selection screen.