Angry Birds Star Wars Bonus Level #7 (S-7) is unlocked by accumulating a total of 385 stars. Once you have accomplished this task, you will be prompted to play the level right then and there, or, you can access it via the “Bonus Episode”. To 3-star S-7 time your shot straight ahead with R2-D2 so that he blasts as many Storm Troopers and as much TNT as possible. If needed, use another R2-D2 to mop things up.
Go back to the Complete Star Wars Golden Droids & Bonus Level Guide. If you have a different strategy feel free to leave a comment below; however, don't just post your score via the comments, as that's what the leaderboards are for.