Having entered among the favorite games of Italians a couple of years ago, sudoku is used on the beach, subway or in the office before starting work, just to awaken the mind.
It consists of a grid made up of 9 quadrands which in turn are made up of 9 mini-quadrants. The goal is to enter the numbers from 1 to 9 in order to fill in all the mini-dials and not to repeat the numbers on the same row or column. If you are playing at a difficult level and can’t get out of it, your iPhone could help you.
Thanks to the Sudoku Grab program, in fact, just take a photo of the grid to generate the solution. If your goal is to play, however, the application contains about 1,000 grids to practice with.