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.
Change the Angle of the top grappling hook from “north” to “northwest” or facing up-left 45 degrees. It makes hitting that first grapple easier, and makes for easier swinging without having to flail around so much. Do it right and you can get to the finish line in 3 grapples. The first one pulls you up, the second moves you over to the ledge, and the third attaches behind the finish line, pulling you up the ledge with a second to spare.