Shrek the Third Codes -

10,000 Bonus Coins
Press , , , , , at the Gift Shop to receive 10.000 Bonus Coins.

Unlock Charming and Grimm difficulties
You can purchase the Charming and Grimm difficulties in the Gift Shop at the main menu:

Charming difficulty - Buy in the gift shop for 15,500 coins.
Grimm difficulty - Buy in the gift shop for 1,500 coins.

Unlock Bonuses
Bonus Damage - Buy at the Gift Shop for 10,500.
Bonus Fairy Dust - Buy at the Gift Shop for 7,700.

Unlock Costumes
Donkey: Dragon Disguise - Buy at the Gift Shop for 3,650.
Fiona: Funeral Dress - Buy at the Gift Shop for 2,150.
Puss: Evil Knight Disguise - Buy at the Gift Shop for 2,850.
Shrek: Knight Armor - Buy at the Gift Shop for 3,500.
Shrek: Pirate Outfit - Buy at the Gift Shop for 4,250.
Shrek: Regal - Buy at the Gift Shop for 3,200.
Shrek: Swim Trunks - Buy at the Gift Shop for 3,350.
Sleeping Beauty: Gown - Buy at the Gift Shop for 2,500.