You can have four possible answers: • One solution for a square and the grid in progress is correct. • One solution for a square but the grid in progress is wrong. • No solution possible and the grid in progress is wrong. • Input Error with equal numbers in row, colomn or area.
An irregular Sudoku is made up of nine irregularly shaped regions. As with a regular Sudoku, you have to find nine digits by region, column and line.
Google Chrome is the most used Web browser. Its display speed is very useful here.