Shoot the Yellow bird to break through the third wooden plank above the fruits, and continue hitting the right side wall. If you do it right, the three pigs at the right will be popped. With the next two Boomerang birds, break through the second wooden plank which is also on the top. After the second Boomerang Bird, the whole right side should fall. If needed, pop any fruits or objects remaining or continue breaking the left wall for bonus points.