Bad Piggies Flight in the Night Bonus Level 4-IV (4-4) can be 3-starred with a single contraption but two runs. Pull the floating blocks with the ghostly motorcycle. Cut the rope at the end of the first road to let the piggy go. You then have a choice: Grab the star box, or avoid Krak-Snap.
If you have a different strategy for completing this level feel free to leave a comment below.