Bad Piggies Flight in the Night Level 4-30 can be three starred using a single contraption. Create a 2×2 contraption whose bottom row has wooden boxes with TNT and whose top row has metal boxes with our piggy and egg. Place this contraption on a single vertical spring, on the left side. When it topples, detonate the TNT to throw our heroes rightward toward the finish line.
If you have a different strategy for completing this level feel free to leave a comment below.