Bad Piggies Tusk ‘Til Dawn Level 5-15 can be 3-starred using a single contraption, but requires two runs. To grab the star box, place the piggy alone in the bottom-right corner. Build a basic 3-box cart that will traverse the left side of the level, eventually pushing the piggy over the hump to the goal. For the final star, destroy the contraption. Instead, place the Halloween piggy in the top-right corner and let him bounce away!
If you have a different strategy for completing this level feel free to leave a comment below.