Birdday Party 18-10 (or Birdday Party Cake 2 Level 10) is the tenth level of Birdday Party.
Fire the Blue bird through the vertical ice block in the top-left of the structure. At the least, this should pop one pig and disrupt the stability of the tower. Next, loft a Boomerang bird over the structure and spin it into the small hut in the bottom-right corner, popping the two pigs there. Finally, loft another Boomerang bird and spin it into the wooden support leg on the right side of the main tower.