To win the level, you must take a time to think of a strategy popping 3 top pigs.
Remember, Lazer Bird fly to the target in a line, so use that to think out of a strategy.
First, you need to pop the 3 top pigs. Simply shoot the Lazer Bird near the top-right Medium Pig. When he's close to the pig and the stone blocks. Then, choose your target and tap it so the Lazer Bird can pop the Medium Pig, push the thin vertical stone block to the left and pop Hekto Porko and also the top far-left pig, through the top far-right pig is hard to pop. Then send the next Lazer Bird below the right floating Small Pig. Then tap below the left Medium Pig. He should push the blocks into the Small Pigs and pop them. Then, use the last Lazer Bird to pop all of the remaining pigs. Remember to destroy as much as you can along the way. You can use an another strategy to pop the pigs, just remember that Lazer Bird always flies in a line to the target.