Aim your launch at the first pig. Your goal is to pass through the gap and ignite the bomb.
Power Activation Point
Activate your power a little before or right after you hit the first pig. You want to be able to break the wooden blocks to ensure your landing on the bomb line.
First Shot Result
After the bomb line ignites, it blows up the wooden boxes holding steady the pig in the circle. The metal circle stars rolling down, killing most if not all of the pigs. Note: You can still get three stars if you use two birds in this stage, given that you have destroyed enough blocks.