Sudoku is a popular logic-based placement
puzzle game. Put the missing numbers
from 1 to 9 onto the grid. Every number occurs once in every row and column
and in every 3x3 block. You are given some of the numbers as clues. Your aim is to place
the rest of the numbers correctly. Click on a box and use keyboard numbers 1 - 9.
Press 'space' to erase. Click arrows to select level anytime, have fun with Sudoku.