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Playstation 2 - Lego Racers 2 cheats

Unlock Martian as playable character:
Go to the main menu and enter 
Right, Left, Right, Up, Down, Left, Right, Up, Up

Unlock mars track
Pause the game while playing, and enter
Left, Left, Right, Right, Left, Left, Right, Right, Down, Left, Right

Turn on wide angle mode:
Pause the game while playing, and enter
Left, Left, Left, Right, Right, Right, Up, Up, Up, Down, 
Down, Down, Left, Left, Left, Right, Right, Right.