Unlock 9320 Battle Droid:
To unlock the 9320 Battle Droid as a playable character, collect all of the gold in the Light
Unlock Cheat Mode:
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 away
Unlock Dark Campaign:
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
Unlock Earth Golem:
Complete the Light Campaign to unlock the Earth Golem as a playable character
Unlock Fetica:
To unlock Fetica as a playable character, collect all of the gold in the Dark Campaign
Unlock Stone Gnome:
To unlock the Stone Gnome as a playable character, successfully complete the Dark Campaign