This shot can be quite tricky and will take you a couple of tries to achieve. First aim the pig a little headway above the magnet. You want the pig to go just a little near to “pull” the magnet up.
Power Activation Point
Once your pig feels the pull of the magnet, immediately fire at the leg that host the magnet. You want to be able to kill that bird inside the leg.
First Shot Result
The magnet gets pulled and fly to destroy the center and the metal blocks to the far right. The other magnet falls down and kill the rest of the birds, earning you the three star mastery.