The following are known Action Replay Codes for The Hobbit: The Prelude to the Lord of the Rings on Nintendo Game Boy Advance (GBA).
These codes were also known as GameShark Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

Master Code – Must Be On
0eba64f2
d7b42f65
a2cb101b
36f3d237

Infinite Lives
d14dc05e
36380d71

Infinite Items
3d47aa21
ee79b839
a55989f4
379e25a1