A free app for Android, by WoogGames.

This puzzle is based on the laws of classical mechanics. The goal is to combine the two shapes, a circle and a rectangle, to build a variety of mechanisms. You can combine the shapes in any way you want. The only limitation is your imagination!

The puzzle consists of many different stages. In each stage, you will be given the same two shapes, a circle and a rectangle. But the way you combine them is up to you. You can combine them in any way you want. The only limitation is your imagination.

The puzzle is designed to be challenging and fun. The more you solve, the more new stages you will be given.