Angry Birds Star Wars Bonus Level #8 (S-8) is unlocked by accumulating a total of 480 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-8, aim R2-D2 just within either the northernmost or southernmost gravitational field. He should loop around and blast the TNT just east of center. Now use C-3PO to blast the remaining TNTs.
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.