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Playstation 2 - Grooverider: Slot Car Thunder cheats

Go to the main menu. Choose "Single Player", after select "Time Trial" 
options and type a name to unlock the "Cheats" option. Go back to 
the main menu, select the "Cheats", then type any of the codes bellow:

Unlock all extras + Ghost mode: Type "MARK"
View credits: Type "BGM"

Unlock Bedroom car:
Win the Dining Room track twice in the 3V class. 

Unlock Eagle car:
Win the Dining Room track once in the 3V class. 

Unlock GT Sport car:
Win the 3V and 6V class in championship mode.

Unlock Harrier car:
Win the Dining Room track once in the 3V class. 

Unlock Sprit car:
Win the Dining Room track once in the 3V class.