Star Wars: The Force Unleashed II

Important: When you do get to the towers, face them and tap Y. Do NOT hold Y as this will cause your lightning to branch off and kill enemies without going through the tower first.

Go to level select and choose "Kamino - The Return" (next to last mission). You'll want to choose easy difficulty. Your first encounter with the lightning towers is a decent way into the level. It will be just moments after the part where you and Kota work together to cross the broken bridge. After that, you will end up outside.

Once outside, you'll drop down a couple of ledges to meet up with a wave of enemies. You'll notice a sniper on top of the wall ahead of you. He is standing to the right of first tower (note the electrical discharge from it). You'll need a crate to jump on at the bottom to get up to his level. Try not to kill anyone on your way up. Still, you're probably only going to get a couple on this tower.

Moving on forward, a group of stormtroopers come around the pathway slightly to the left. Jump over them and advance to the next tower (not too far ahead on the left). You'll also have about 4 imperial robots to deal with, but the tower will keep them at bay until you're finished.

Once done with that group, advance to the large bay door ahead. It will open to reveal a decent size group of stormtroopers. Turn around and run back to the tower (it's not very far) and use it to kill them as well. At this point, you should have your 10 kills with a few to spare. If for some reason something went wrong, you hit a checkpoint as you reached to door, so just suicide. Doing so before that checkpoint means dealing with the robots again.

If you have any questions, just leave a comment.

When you're the second time on Kamino, when your outside there are huge lightning towers, simply go close to one and use force lightning, the lightning should hit the tower and from there the troppers. kill yourself when the troopers are dead and repeat till you get it