YAYCARS - All cars
IMSPEED - Fast start
VROOOOM - Infinite boost
TRGTEXC - Unlock Master's Speedy circiut and Master's Countdown cleanup
MATTL66 - Unlocks all tracks and mini games
IF900HP - Unlocks all tracks and mini games
R4MONE - Unlocks all paint jobs
CONC3PT - Unlocks art
WATCHIT - Unlocks movie clips
Hints
Avoid getting lost
If you ever get lost in the desert, follow Mater or any other car without bumping into them. They will take you back to Radiator Springs.
Lightning bolt
The first stripe (near the fire house) of the new road is actually a lightning bolt.