Review Excerpt: In this app, children snap together nine machines and vehicles by dragging and dropping the various pieces into place. Incorrect answers just fall back to the side; correct positions fall into place with a satisfying snap. Content includes an airplane, car, cement mixer, crane, digger, motorcycle, ship and train. Upon completion each machine starts to work. Subscribers, please log into our database using your password to read the full review along with our rating, and see why this received our Editor’s Choice Award.