Invincibility.
OK, this is the ONLY way to be Invincible, first, enter any battle, then pause game play, and enter this cheat,
Up (3), left, Down (3), left, Up (3), left, right,
Now you are Invincible, enter the Cheat again to turn it off, and you won't have to re-enter the cheat when you go to a different mode.
We have more cheats and tips for this game here, Star Wars: Battlefront II (2005) cheats
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