The goal of this stage is to kill all the pigs with just one shot. Aim your shot with the intention of setting off the bomb on the ground to the right. It should note that that bomb is pretty easy to set off, as long as you grab the right pieces with the power.
Power Activation Point
Grab the pieces as Princess Leia bird is passing through the top.
First Shot Result
The towers break off after you pull the pieces. The flying pieces also kill the big flying black pig. You will trigger the bomb and kill all the pigs to walk away with the mastery of three star ratings.