Shrek Cheats

In the prince's castle there are chickens that run around, if they are a
nonsense to you just do this, pick up the chicken and bring it to a
torch and jump up to the torch if it doesn't work the first time keep
jumping close by it or over it, you can also take them up to the
princess room and punch them into the fire that works better. If done
correctly they should pop and feathers will go everywhere

Perform at least four good deeds to unlock race mode. Play in race mode to get tokens to buy and unlock the following cheats: Chalk Mode, Crude Oil Mode, Cyber Shadows, Fast Mode, Infinite Flame, Infinite Gas, Invulnerability, Leak Mode, Low Gravity, Money For Merlin, Plastic Mode, Super Flatulence, and Super Strength.

Press Up, Down(2), B, A(2), X, Down, Up, Left, B at the title screen.

Anywhere in the game that you can manage to fall off the main game map, you will be teleported to the chicken experimentation room. Note: You cannot get out without restarting the XBox. Some ways to get into the room include:

Sweetsville factory Unlock the low gravity cheat and jump on the roof of the building that holds the power switch. Jump off into the water behind it.

Prince Charming's Castle Jump out of the window that you are supposed to kick the prisoners out of.

At the title screen press Up, Down, Down, B, A, A, Z, Down, Up, Left, B