Birdday Party 19-9 (or Birdday Party Cake 3 Level 9) is the ninth level of Cake 3 in the Birdday Party episode.
The boulder at the far-right must have a big destruction to the blocks below it or you must have a big lucky destruction to the blocks with the hammer to get high score. It's not hard to get 3 stars if you know how to use the hammer with the Pink Bird.
Send a Yellow bird through the plank in the top-right corner, making sure to pop the pig below. Use the Pink bird to lift the hammer on the left side, detonating both TNT and destroying all bystanders.