Enter the atmosphere of the first planet using the angle shown in this picture.
Power Activation Point
Activate the laser gun power when you have a clear shot of the wooden blocks. Note that your laser gun must reflect back to kill the pig in the bubble.
First Shot Result
Your bird continues to fly and bump into the building on the right planet. The blocks fall down to trigger the TNT, which causes the other bomb to explode. Note that you must destroy enough blocks in this stage to obtain the three star reward.