Sudoku
Fill the grid so every row, column, and 3×3 box contains the numbers 1 to 9 exactly once.
Generating puzzle…
About Sudoku
Sudoku is a logic-based number placement puzzle played on a 9×9 grid divided into nine 3×3 boxes. The goal is to fill every cell so each row, each column, and each box contains the digits 1 through 9 with no repeats. Every puzzle here is generated with a single unique solution, so it can always be solved with reasoning rather than guesswork. Pick a difficulty — from easy to expert — and a fresh puzzle is created instantly in your browser.
Frequently asked questions
How do you play Sudoku?
Fill the 9×9 grid so that every row, every column, and each of the nine 3×3 boxes contains the digits 1 to 9 exactly once. Use the given numbers as clues to work out the rest.
What do the difficulty levels mean?
Higher difficulties start with fewer given numbers, so you have to deduce more cells. Easy gives the most clues; expert gives the fewest.
Is every puzzle solvable?
Yes. Each puzzle is generated to have exactly one unique solution, so it can always be solved with logic alone — no guessing required.
Is this Sudoku free?
Yes. It runs entirely in your browser with no sign-up, and a brand new puzzle is generated each time you start a game.