You can have four possible answers: • One or several advices on one or several squares and the grid in progress is correct. • One or several advices on one or several squares but the grid in progress is wrong. • No advice possible and the grid in progress is wrong. • Input Error with equal numbers in row, colomn or area.
The rules of an irregular sudoku are similar to a classic Sudoku with a difference: here the regions are irregular in shape.
On this page type the speed of Google Chrome is appreciated in the display of multiple boards.