Birdday Party Cake 2-9

Birdday Party 18-9 (or Birdday Party Cake 2 Level 9) is the 9th level in Cake 2 of Birdday Party.

Strategy
Launch the Bubbles into the top-left corner of the first structure, expanding it just before impact. This should cause towers to fall rightward, detonating some TNTs along the way. Use Matilda as necessary to pop any remaining pigs.