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Sudoku

Every row, column and box must contain each number exactly once. Every puzzle here has exactly one solution.

Size Difficulty
Time 0:00
Name: ______________ Date: ______________
Sudoku · cerebite.com

How to play

Tap an empty cell, then tap a number (or type it on a keyboard). In a 9×9 grid each row, column and 3×3 box needs the digits 1–9; the 6×6 uses 1–6 with 2×3 boxes, and the kid-friendly 4×4 uses 1–4. "Highlight mistakes" instantly marks any number that clashes with its row, column or box. Every puzzle is generated fresh with a mathematically verified single solution — no guessing required, logic always wins. Press Print for a clean paper version: your pencil marks are left out, so the sheet shows only the original clues.

More to try

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Othello (Reversi)

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Tic-Tac-Toe

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Connect Four

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Minesweeper

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15 Puzzle (sliding)

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Nonogram (Picross)

Frequently asked questions

Does every puzzle really have only one solution?
Yes — the generator first builds a complete valid grid, then removes numbers one at a time, and after every removal it re-solves the puzzle to confirm exactly one solution remains. If a removal would create a second solution, the number stays.
Which size should a beginner start with?
Start with 4×4 to learn the one-of-each rule, move to 6×6 to practice box shapes, then take on the classic 9×9 on Easy. The rules never change — only the amount of logic you chain together.
Can I print puzzles to solve on paper?
Yes — press Print and you get a clean sheet with only the original clues (your on-screen entries are excluded), a name/date line, and no ads or buttons. In the print dialog you can also choose "Save as PDF".