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.
- See how you compare to others.
- Solve the same puzzle simultaneously with others and score as many points as possible.
- Solve the same puzzle against others simultaneously. Winner is first to complete the puzzle.
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A scoring system has now been introduced. The motivation behind
this is to try introduce a uniform performance metric across all puzzles, including those entered manually from other sources.
For details on the scoring formula, see the
Using the Save/Load and some other Solve options will invalidate scoring for that puzzle.