Free Sudoku Online
Sudoku is a number-placement puzzle game. It is typically played on a 9x9 grid, divided into 3x3 subgrids or regions. The goal is to fill in the grid with digits from 1 to 9, ensuring that each row, each column, and each of the nine 3x3 subgrids contains all of the digits exactly once. The objective is to fill the grid so that every column, every row and every 3x3 box contains the digits 1 to 9. Sudoku can have different levels of difficulty and there are many variants with different grids and different rules.
Fill in a number in every square so that every number appears exactly once in each row, each column and each block marked by thick lines.
To place a number, click in a square to select it, then type the number on the keyboard. To erase a number, click to select a square and then press Backspace.
Right-click in a square and then type a number to add or remove the number as a pencil mark, indicating numbers that you think might go in that square.
When you master the basic game, try Jigsaw mode (irregularly shaped blocks), X mode (the two main diagonals of the grid must also contain every number once), Killer mode (instead of single-cell clues you are given regions of the grid each of which must add up to a given total, again without reusing any digits), or all of those at once!
Courtesy of Simon Tatham's Puzzle Collection via the MIT license.
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