What a great game!
This game reminds me of the little plastic number sorter I used to have when I was a kid. I remember playing it for hours while on road trips with my parents. This game is also just as addictive, challenging your wits to see if you can sort the numbers in as few moves as possible. Or, if you have a buddy with an iPhone or iTouch, have a contest to see who can solver faster - very fun and I think it is making me smarter - good brain exercise!