Bad Piggies Flight in the Night Level 4-29 can be three starred using a single contraption. The vehicle is two boxes wide. From bottom to top, the vehicle uses wooden wheels, wooden boxes with TNT, vertical springs, and finally metal boxes with our piggy and egg. Let the contraption drift to the bottom of the hill. When it angles the metal boxes leftward, blow the TNT. Fire in the hole!
If you have a different strategy for completing this level feel free to leave a comment below.
Don’t really need the springs. Hill is so high egg comes rolling down after a bit. They look cool though.
I was having problems with the contraption toppling forward when it reached the up slope. Putting the left side TNT on its own instead of in a box fixed that. Got it first time.