On level 5 at the end while Anakin is walking away from the cannon you where using to take the ship out hold down Square and move the left Analog stick and the cannon you where in is now firing into space.
Episode IV Death Star multi-player level
Successfully complete mission 17 in story mode.
Force Regeneration
Several areas of the game require you to open a door and enter into an area, at which point you'll be attacked by enemies. In some of these places, if you're health and/or force energies are low and need to be given time to recharge, simply stand back past the doorway to the previous room. Most of the time, the enemies cannot pass the room they are in, and will stand huddled in the doorway. Also, using Saber Throws (Or, later in the game, when Anakin aquires Force Lightning) you'll actually be able to get to these safe spots and kill the enemies that are standing just outside the doorway. This is especially helpful during missions like the "Assassination on Mustafar", where you'll constantly find yourself fighting Brutes, Guards, and Battle Droids.
Losing Skill Points
As time passes without you attacking enemies, you lose skill points. The number of points you lose per second increases as more and more time passes.
Multi-player mode characters
Successfully complete the following missions in story mode to unlock the corresponding character in multi-player mode:
