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Gamecube - Micro Machines cheats

Unlock Hovercar:
Play in challenge mode and win the Platinum Cup.

Unlock new vehicle:
Play in championship mode and win the Platinum Cup 

Find the three hidden stars on the indicated level in single palyer mode 
to unlock new features:

Big Heads: Find the 3 secret stars in This Ol' House GP.
Bird's Eye: Find the 3 secret stars in Perilous Places GP. 
Color Tint: Find the 3 secret stars in Hoedown GP.
Concept Art: Find the 3 secret stars in Jungle Jamboree GP. 
Earn The Team: Find the 3 secret stars in Graveyard GP.
Micro Marble: Find the 3 secret stars in 911: Emergency GP.
Micro Soccer: Find the 3 secret stars located in Beachside GP.
Mirror Tracks: Find the 3 secret stars in Toy Town Sci Fi GP.