This stage is pretty easy. The hardest part is to get the timing of your laser powers correctly. Aim and shoot towards the TNT bomb in the middle.
Power Activation Point
Tap your power towards the wooden block to the right. You will have to destroy it to let the metal squares fall, while setting off the bomb with one of your laser shots.
First Shot Result
The bomb explodes dealing damage to the blocks below. While your lasers kill all the pigs to the right using the metal blocks. You will then earn the three star mastery if you have destroyed enough blocks to fulfill the high score requirement.