My 12-year-old begs to play this for homeschool.

Mildly fun, and even I play sometimes. I love the cute faces on the states. The states bounce a little and tip (and sometimes even fall) when you drop them. Worth the small price. App runs smoothly on my Mac (older Mac but running Lion). Not a big, fancy game, but its one of the best Ive seen for education.

Spaghett_Face about Stack the States