One non-character swap strategy for Angry Birds Star Wars II Rewards Chapter level PR-18 is to fling the Shocktrooper up so he splits the ropes holding the Gungans. As he passes the spinning wheels fire his blaster towards the Gungans on the far right. This should finish off the level. The score in the video below is 114,720.
Reward Chapter levels are unlocked by obtaining a predetermined amount of damage points with a specific character. For a complete layout of these thresholds, see our achievements list. We also have a handy Complete Characters Guide that breaks down all the characters and their abilities. If you have a different strategy leave a comment below; however, don't just post your score via the comments, as that's what the leaderboards are for.