Shrek Smash n' Crash Racing Cheats for PlayStation 2
Also on: Wii Nintendo DS GameCube PSP
Using any character complete the Conventional and Mirrored Tournament mode to unlock maps and characters.
Goldilocks:
Complete Mirrored Tournament with any character.
Humpty Dumpty:
Complete Conventional Tournament with any character.
Pinocchio:
Complete Mirrored Tournament with any character.
Prince Charming:
Complete Conventional Tournament with any character.
Puss In Boots:
Complete Conventional Tournament with any character.
Red Riding Hood:
Complete Conventional Tournament with any character.
Thelonious:
Complete Mirrored Tournament with any character.
Three Little Pigs:
Complete Mirrored Tournament with any character.
Complete the tournament or cup challenge with any character and the following charcters will be unlocked an playable.
Goldilocks (but not the three bears) 
Humpty Dumpty
Little Red Riding Hood
Pinocchio
Prince Charming
Puss-In-Boots
Thelonious
The Three Little Pigs
Pinnochio- Come first in Swamp Cup Mirror Mode
Three little pigs- Come first in Far Far Away Cup Mirror Mode
Goldilocks- Come first in Factory Cup Mirror Mode
Theolonious- Come first in Dragon Cup Mirror Mode
Below are how to unlock some characters:
Unlock Puss in boots- Come first in Swamp Cup
Unlock Prince Charming- Come first in Far Far away cup
Unlock Humpty Dumpty- Come first in Factory Cup
Unlock Red Riding hood- Come first in dragon cup
Hope I helped
Also on: Wii, Nintendo DS, GameCube, PSP, check out those pages for more help with this game.