Our “easier” strategy for Summer Pignic level 9 is to fire the first Yellow bird through the base of the wooden tree, causing it to collapse. Launch Big Brother through the rubble of the tree and take out the pigs on the left side. Use the next Yellow bird to pop the pigs in the small cart, and the last Yellow bird into the foot of the right tower.
Easier Method, scoring 100,310.
High Score Method, scoring 120,810.