This page contains the solution of level 2-3 in episode 2 (Rise and Swine) from the popular iOS and Android game Bad Piggies. Below you can find a walkthrough for building the right contraptions needed to earn all 3 stars.
The third level also requires you to build a simple contraption. Make a L-shaped contraption: first put a suction-cup tire on the bottom-left, 2 steel boxes above and another suction-cup tire on the top-right. Put the pig in the left box and an engine in the right. Feel free to add a comment when you've got a different strategy.