Bad Piggies When Pigs Fly Bonus Level 3-IV (3-4) can be 3-starred in one step. This took a while to figure out, but is quite repeatable once it’s determined. Use the propeller to climb all the way to the top-left box. Pop all balloons before rolling down the hill to maximize speed. The soda should help you clear the last gap.
If you have a different strategy for completing this level feel free to leave a comment below.