Bad Piggies Rise and Swine Level 2-34 can be 3-starred using a single contraption but two runs. Place suction cups above and powered wheels below a basic 3-box vehicle. For the star box, have the soda bottle’s nozzle facing rightward. Drive right and take the high road for a little bit before turning on the suction-cup wheels. This will send you back toward the star box on the left, and you can slowly drift to the finish line. To beat the clock, switch the soda bottle around to face left and use it during the second high road, since the contraption will naturally slow down significantly there.
If you have a different strategy for completing this level feel free to leave a comment below.