Sudoku is a puzzle with a grid containing nine large blocks. Each block is divided into its own matrix of nine cells. The rules for solving Sudoku puzzles are very simple: each row, column and block must contain one of the numbers from "1" to "9". No number may appear more than once in any row, column, or block. When you've filled the entire grid, the puzzle is solved.

"Easy" and "Medium" puzzles are available on demand (unlimited).
A new "Hard" puzzle is available every hour.
A new "Tough" puzzle is available every day.

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Try the challenge of Sudoku 16 - sixteen rows, columns and blocks instead of nine.

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Personal statistics are recorded for users that have registered. This includes a Rank Index which is the average of the last 12 scores discarding the highest and lowest. Your stats will be shown whenever you complete a puzzle which records a score. If you have not registered yet, join now for free.