"Got this at Costco yesterday and my son had a fun time putting this together and playing with it. There are a lot of very clever design elements in this set. The "interactive display" using blocks moving behind stickers was one of them, and a rocket gantry that "falls away" was another. The smart phone app makes everything come to life and uses some real sounds from space missions. As a parent I had just one question- What is the little white rubber band for? It is in a separate cardboard box and listed on the inventory, but we must have missed where to put it."