The Lord Of The Rings: The Third Age Codes -

Balin's Tomb mission:
Successfully complete the game.

Gap Of Rohan mission:
Successfully complete the game.

The Board Is Set mission:
Successfully complete the Balin's Tomb and Gap Of Rohan missions under the hard difficulty setting.

Sauron Comes mission:
Successfully complete the game in Good mode.

The Last Alliance mission:
Successfully complete the game in Evil mode.

Rohan Outpost mission:
Use a link cable to play with another Game Boy Advance.

Skip Combat option:
Successfully complete the game.

Haldir:
Successfully complete The Black Gates level under the hard difficulty setting in Good mode to unlock Haldir, the elven Captain of Lothlorien. His stats and equipment are:

Shagrat:
Successfully complete The Black Gates level under the hard difficulty setting in Eood mode to unlock Shagrat, the Uruk-Hai commander of Minas Morgul. His stats and equipment are: