Construct an assembly line to make geometric tangram shapes needed to rebuild a village. This requires dragging command squares onto a grid. You can determine the direction, shape, rotation and color of the part. There's a bit of a learning curve to this app, but it's not bad, and the leveling is well done, making it well worth the download. We liked that there are often several different answers to the same problem, and that it is possible to debug your invention. Content includes 70 puzzles in four settings. This is an ethical app with no ads, IAP or commercial content.