To unlock the Dark Campaign, start a new game, enter what you'd like your save game name to be. Then, at the Episode Selection screen, enter this code: X, Y, Y, X, X, Y, X, Y.
To unlock the 9320 Battle Droid as a playable character, collect all of the gold in the Light Campaign.
Complete the Light Campaign to unlock the Earth Golem as a playable character.
To unlock Fetica as a playable character, collect all of the gold in the Dark Campaign.
To unlock the Stone Gnome as a playable character, successfully complete the Dark Campaign.
To unlock God Mode and Complete Mission in the pause menu, pause the game and press these buttons: X, Y, X, X, Y, Y, X, Y, X, X, Y, Y.
Cheat Codes
