Stack the States is an incredibly fun and educational app. In couple of weeks of playing this game, my kids have learned a whole lot of geography of the United States. I've managed to learn quite a bit myself just by listening to them play/talk about it. Highly recommended.

Did you know that the smallest country in the world is Vatican? Monaco is next smallest? With Stack the Countries, kids learn about countries, capitals, location, landmarks. Brilliantly done and keeps the kids engaged and coming back for more. My third-grader already has a "bucket list" of countries he wants to visit!

While your rocket is floating weightlessly in space, the real fun begins!

Build rockets, but you need to earn points by doing math before you can buy all the parts you need. My kids are hooked. Yours?