Quick Rotation (Doof.com)

Truly interesting and yet simple game based on fresh principle, which reminds a mathematical rebus The Loyd's fifteen. Imagine a 3x3 spreadsheet and in each field is a number from 1 to 9, no repeat. You must sort the numbers from lowest to highest by using a square, where it is possible to rotate the numbers. Rotate until you achieve desired condition. It is quite difficult, however interesting too, try it for yourself.