First Shot
Enter the planet at the angle and position shown in the picture.

Power Activation Point
Activate the laser gun power at the location shown. You want the lasers to break through the wood and trigger the TNT bomb.

First Shot Result
The bomb kills the pig next to it instantly. Your bird continues the fly to crash into the crane like structure to trigger the second bomb. The explosion kills the rest of the pigs and gives you the nice three stars.