Shift 2: free puzzle app for iphone, ipad

Shift 2 is an inversion maze puzzle. There are 120 levels. It came out July of last year, and somehow I missed it. Shift 2 has been downloaded over 1,000,000 times.

I've spent about 45 minutes and got through levels 1 - 8. Considering the price, it's pretty good value.

This game/puzzle may not be free forever, so download it soon.