Numbercross: free ipone ipad puzzle app

Numbercross is a free puzzle app fro the iphone, ipad. The goal is to get the correct number to the top of the grid. 1 can swap with 2. 2 can swap with 1 or 3. 3 can swap with 2 or 4. Get the idea?

There are 38 levels. I've done them all. It's fun!