Best Free Sudoku
Fill the 9×9 grid so every row, column and box holds 1–9 — fresh, uniquely-solvable puzzles.
Level 1
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How to play
- Select a cell. Click (or tap) an empty cell to select it. The given numbers are fixed and can’t be changed.
- Enter a number. Type 1–9 on your keyboard, or use the number pad below the grid. Backspace or 0 clears the cell.
- Fill the grid. Place 1–9 in every row, column and 3×3 box with no repeats. The puzzle solves itself when the board is complete and conflict-free.
About Sudoku
Sudoku is the classic logic puzzle. 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. Some numbers are given to start; the rest you work out by elimination — no guessing required. Every puzzle here is generated fresh in your browser and has exactly one solution, so there’s always a logical path to the answer. Pick your difficulty, click a cell and type a number (or tap the on-screen pad on a phone). Clashing numbers are flagged so you can spot mistakes. No signup, no download, nothing uploaded.
Frequently asked questions
Fill the 9×9 grid so that each row, each column and each of the nine 3×3 boxes contains the digits 1 through 9 exactly once. Use the given numbers as clues and work out the rest by elimination — click a cell and type a number to fill it.
Yes. Each puzzle is generated to have exactly one unique solution, so it can always be solved by logic alone — you never have to guess.
Difficulty sets how many numbers are given to start: easy reveals about 38, normal about 30 and hard about 26. Fewer givens mean more deduction and a harder solve.
Select the cell and press Backspace, Delete or 0, or tap Erase on the number pad. Any number that clashes in its row, column or box is highlighted in red so mistakes are easy to spot.
Yes. Tap a cell to select it, then tap a digit on the on-screen number pad. The grid scales to your screen, so it plays well on phones and tablets.
Completely free, with no signup, no download and no paywall. Puzzles are generated and played entirely in your browser — nothing is uploaded.
No. Sudoku works with no signup at all; an optional free account only exists to unlock higher usage limits.
Your input is processed in memory and never stored, so nothing is left behind once you have your result.
Casual use is unlimited, under a generous fair-use cap that keeps it fast for everyone.
All modern browsers — Chrome, Safari, Firefox and Edge. Sudoku needs nothing installed beyond the browser you already use.