Unlock 6 Unique Graphic Modes
     On  the  main  menu enter the Extras menu and go to Cheats. Go to
Entr a Code to input your password.

GFXMODES: 
     Unlocks Graphic Modes with L3 button Dream, RC Car, Puke Cam, All
Combined, and Normal

Unlock Secret Special props in constructor mode
     From  the  main menu, go to Extras and go to Cheats. Then type in
the following code:

COOLPROP: Unlock Secret Special props in constructor mode

All cheats

All cheats
     To unlock all the cheats in the game, simply become the #1 ranked
Stuntman  aka  the  Legend ranking. Once you do so, go to your options
then extra menu and you will have all the cheats unlocked.

     Note:  Getting  #1  does  not  require 5 stars on every different
mission, so don't be too afraid of this some what daunting task.