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Xbox 360 - Project Gotham Racing 3 cheats

Unlock Geometry Wars 1 and 2 minigames.
View and walk around your cars in the garage. Go in to backt and you will  find 
two arcade machines.

Unlock cars:
90000 Kudos - Cadillac 16
300000 Kudos - Ford GT90
10000 Kudos - Ford Mustang GTR
120000 Kudos - Ford Supercar Concept
50000 Kudos - Nissan GTR
475000 Kudos - RUF Supercar Concept
160000 Kudos - Shelby Cobra
390000 Kudos - Shelby GR-1
230000 Kudos - Toyota GT-One