Bad Piggies Rise and Swine Bonus Level 2-IV (2-4) can be 3-starred using a single contraption, but will likely take you several tries. On your single box, place two wheels on the bottom and right, and two grappling hooks at the other sides. Swing your way upward, keeping in mind that the grappling hook has a limited reach. It’s not easy, but practice makes perfect.
If you have a different strategy for completing this level feel free to leave a comment below.