A classic sudoku puzzle is a 9x9 grid divided into nine 3x3 boxes. The rules are simple: every row, every column, and every 3x3 box must contain the digits 1 through 9, with no repeats. The starting grid is partly filled, and the rest is up to you.
Every puzzle on this page has exactly one solution, graded by the solving technique required: easy puzzles can be finished with naked singles alone, medium puzzles need a few hidden singles, and hard or expert puzzles require more careful deduction. Start with an easy one and work up.
Play online with our interactive solver. It saves your progress in your browser so you can come back later. Or use the print button to take a puzzle with you.