Angry Birds Star Wars Bonus Level #2 (S-2) is unlocked by accumulating 70 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 C-3PO into the top of the tower, triggering his explosion upon impact. With a little luck, the entire structure can collapse into a heap of rubble.
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.