Unlock Alternate Crash
To modify the character 'Crash' pause gameplay and enter either of these two codes for the version of Crash you want. To disable the effect and return the game to normal just pause the game and enter the code again.
Unlock Big Head Crash:
Hold R1 and press Square, Square, Triangle, and X.
Unlock Invisible Crash (Shadow):
Hold R1 and press Triangle, Square, Triangle, Square, X.
More tricks, tips and cheats for this game are right here - Crash of the Titans cheats
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