Our strategy for Birdday Party (Birthday Party) level 18-5 is to launch the first White bird just above the first TNT, dropping the bomb next to the TNT and having the bird ricochet into the top-left structure. In this video, after all debris settles, only three pigs remain: bottom-left, dead center, and top-right. Being mindful to avoid the balloon, use the next White bird to bomb the bottom-left structure. Then use the Black bird to attack the middle structure, and a high-arcing shot for the last pig in the top-right. The score in the video below is 180,480.