Cute but useless.

This doesnt teach anything except that the blue thing goes on top of the red thing. Some kind of explanation, audible or written, would turn this from a jigsaw puzzle into a simple physics lesson and would be just as fun. (A three-year-old will need the audible, but look at the Dr. Suess iPad books to see how magic the process can become.) I have seven children and a dozen (and counting) grandchildren. Give them very basic principles and they can understand the world.

Journal Captain of All Captain about How It Works: Machines by Geek Kids