5 stars: There are multiple ways to solve the challenges so bring your creativity! I enjoyed the free game and my kids did too, so I bought the full version to play without ads. One drawback on a phone is it is difficult to get the precise drawing. Some puzzles are too hard for kids. I would suggest having an age or difficulty setting to make it easier for kids.
4 stars: This is by far the most enjoyable and challenging game I've tried. The physics are excellent, most of the puzzles are great and there is a lot of variety among the puzzles. The reason I only give it four stars is that several of the puzzles depend on chance or drawing objects very quickly instead of working out the solution and the way the game is set up you have to get by them to move on. This gets annoying pretty quickly.
4 stars: Fun game! Managed to get 709 stars without any hints! There seems to be several ways to do many of the puzzles and it's interesting comparing my methods to my partner's. Good way to pass time on the bus! If you're connected to internet, I'd say there's a few too many ads. And the lines sometimes jump when playing. Wasn't a big deal though, a quick restart of the level and try again.
3 stars: Awesome game for folks who are engineering, or technically, or physics minded or similar in any way shape or form. Great for the visual problem solver for physical conditions of getting from point A to point d with only certain things provided to accomplish. Having to draw stuff wi...