Choose between different levels and how many numbers you would like to put IN ORDER. First two levels are easy to solve, then starts the trouble. You have to be able to find the moving patterns between rows and columns when you only have a few numbers OUT OF ORDER.
Touch rows or columns with your finger and swipe to move the numbers to the left/right/up/down. Move all numbers so they are IN ORDER from 1 in upper left corner to the highest number in the bottom right corner to solve the level.