This is an interesting stage to obtain the three star mastery. Your first should should aim for the top metal balls. There is a chance that you can kill all the pigs with just one shot. However, you will have to be really lucky to pull it off.
Power Activation Point
Activate the power after you have landed on the metal chains.
First Shot Result
Your shot and power should kill all of the pigs on the right and middle.
Aim and launch towards the spot slightly under the wind blower. Do not hit the wind blower however as it will push it away from where you want it to be.
Second Power Activation Point
Activate the power to push the bottom left corner, push the wind blower so that it destroys the building to the right of it.
Second Shot Result
The wind blower picks up the rest of the pigs and you will earn your three star rewards.