Welcome to the first walkthrough for the seventh episode of Angry Birds, called Birdday Party (Birthday Party)! Our strategy for level 18-1 is to use the Yellow bird at the foot of the left tower. Then use the Orange bird just above the TNT in the middle of the level. If the bird is going past the TNT, be sure to expand it manually to ensure its detonation. The score in the video below is 79,880.