This is more of a glitch than a cheat. On the first level, when you get to the fallen enemy ship (thing) go over to the far gap on the left as a heavy trooper (from the first 3 people you play as are Yoda, Trooper, and heavy trooper) and slowly walk down until you see a droid head. Throw a "Droid Popper" ( a blue bomb) at it. Naturally it will make the droid fall down and "die." However, when you walk further over, a 'mini-cutscene' will appear where both droids turn to you. But wait! Didn't you just "kill" one of those droids?!? Anyway, you can easily destroy one droid with a swift slash of Yoda's lightsabre, but somehow the other droid cannot be destroyed! How is that possible, you may ask, but I don't know, so don't ask me. This can only be done on the ds version as far as I know. I have only tried this once, and this may not be a big deal, but a glitch is a glitch.