Launch you bird under the metal platforms to reach the snow part at the bottom. You may have to attempt this stage a couple of times as the falling tower may not kill all the pigs.
Power Activation Point
Activate your laser shot when you are close to the ground. Your goal is to destroy the wooden block holding up the tall tower all the way to the right of the stage.
First Shot Result
The big tower falls and killing all of the pigs, earning you the mastery of three stars.