When you reach Bree look for the merchant cart at the entrance, Talk to the merchant cart to access the in-game shop where one of the options on the men is 'Codes'. Enter the following codes to enable the corresponding effect.
8-Bit Music: GD35HC
Action Assist: T1JM4R
Attract Studs: C7FJ7B
Berserker: UE5Z7H
Bilbo Baggins: J4337V
Boromir (Captain): HTYADU
Boss Disguises: F3H14H
Character Studs: PR3V4K
Denethor: RJV4KB
Disguises: MX26RJ
Easterling: R7XKDH
Elrond (2nd Age): A9FB4Q
Eomer: U47AOG
Fall Rescue: WS68P2
Fast Build: A2LU58
Galadriel: 7B4VWH
Gamling: AVJII1
Gondor Ranger: LG5GI7
Grima Wormtongue: BU95CB
Hama: 73HJP6
King of the Dead: IH7E58
Lothlorien Elf: C2A58D
Lurtz (Newborn): QL28WB
Madril: C19F3A
Minikit Chest Finder: A24TVJ
Mithril Brick FInder: B72D7E
Mithril Hearts: 2MCRDN
Mouth of Sauron: F4M7FC
Poo Studs: D49TXY
Quest Finder: EY4K32
Radagast the Brown: 5LV6EB
Regenerate Hearts: H5L6N6
Ringwraith White: LYQU1F
Shagrat: PJB6MV
Studs x2: 1F5YH2
