The Lord of the Rings: The Fellowship of the Ring Cheats

Before the second campsite that has the 2 trolls and wolves, find a fallen tree. Follow the tree to find Gollum. After a short scene Gollum will give you the fish which replaces Aragorn's sword for the rest of the game.

In the mines of Moria, as Frodo, stand near Gimli and let orcs almost kill you. Gimli will jump in and rescue you. For the rest of the mines of Moria, he will float off the ground and become invincible. Note- This only works on the EU version of the game.