Description: The objective is to fill a 9x9 grid so that each column, each row, and each of the nine 3x3 boxes (also called blocks or regions) contains the digits from 1 to 9.

Instructions: Use the mouse to fill out the grid in a classic game of Sudoku. Click in the square you want to put a number, click in the corners to leave markers. Get the number wrong too often and you will lose.