Sudoku
Challenge your logical thinking with our Sudoku puzzles.
Saved Sudoku Puzzles
Browse through our collection of saved Sudoku puzzles, or create your own.
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Sudoku is a logic-based number-placement puzzle. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids contains all of the digits from 1 to 9.
Basic Rules:
- Fill in the grid so every row, column, and 3x3 box contains the digits 1 through 9.
- Each digit can only appear once in each row, column, and 3x3 box.
Solving Techniques:
- Scanning: Look for a digit that can only go in one place.
- Marking up: Note possible candidates for each empty cell.