Black Gate/Mt. Doom:
It is recommended to have Stealth Of The Shire 1 and Courage Of Sam 3 to get past the enemies. If you use it, you will block all attacks on Frodo and Sam. Note: This does not work in Multiplayer mode.
Gaining experience:
It is recommended that you complete the extra battles that become available throughout the game. By doing this, all of your heroes will be at a higher level when it is time to use them in the difficult later battles.