Online Sudoku - Free

Four levels of difficulty. Free sudoku.
 
difficulty
Easy
Medium
Hard
Hard+
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9
X
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Sudoku - The rules of the game:

A sudoku is a grid of 9x9 cells, each of which may contain a number 1 to 9. The goal is to fill the empty squares with numbers from 1 to 9, so that each line in the column and each 3x3 region all figures are present for 1 to 9. Have fun!