Clone items and people
Drop an item and save the game. Select continue at the main menu and there will be 2 of the item/person not including Characters
Weapon Power up
If you hold down the "B" button your weapon will start "sparkling" with a sword it will kill a Goblin or an Orc in one hit.
Unlock Gimli in Multiplayer
To unlock Gimli in Multiplayer: beat the game with two characters on any difficulty, then in multiplayerselect an empty slot and choose Gimli as your character.
Unlock Misty Mountains in Multiplayer
To unlock the third level, Misty Mountains, in Multiplayer collect all 8 artifacts found in the game.