Angry Birds Star Wars Bonus Level #6 (S-6) is unlocked by accumulating 310 stars through gameplay in Star Wars. Once you have accomplished this task, you will be prompted and can either navigate directly to the level or access it via the Bonus Episode. Fling the first two C-3POs into the middle and top TNTs in the asteroid field, pushing the square blocks into the path of the laser-toting Oink Fighters. As needed, use one more to blast the remaining TNT.
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.