Whether you're a Sudoku beginner or master, test yourself with three levels of difficulty. Everyday is a new challenge.
Fill the 9x9 grid so that each column, each row, and each of the nine 3x3 blocks contains the digits from 1 to 9, only one time each (that is, exclusively).
The usual approach to solve a Sudoku board is via pencil marks. They remind you which values are still possible for the current cell. You can toggle the pencil marks by clicking on them.
fun, numbers, Sudoku