Free Online Sudoku Puzzles

From beginner Easy to expert Extreme Hard, play in your browser, no sign-up needed.

Fresh puzzle every page load  ·  Wednesday, 24 June 2026

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72 The small number = how many of that digit are still left to place.

Tips for new solvers

  • Scan for singles first. Look for rows, columns or boxes where only one cell can take a digit before reaching for harder techniques.
  • Use Notes for candidates. Pencil in the possibilities for a cell, then eliminate as you place digits elsewhere.
  • Work the most-filled units. Boxes and lines that already have many givens collapse fastest.
  • Relax the stakes. Stay in Relaxed mode while learning. Mistakes simply highlight so you can explore without losing the puzzle.

More ways to play

Five free puzzle games, one calm hub. No account, no app.

Mini Sudoku⚡ 6×6 · 2-min Hard SudokuFor challengers Expert SudokuX-Wing & Swordfish StrandsDaily word hunt CryptogramCrack the cipher

Why play Sudoku?

A few minutes of logic a day is a genuine workout for memory, focus and pattern recognition.

Sharper memory

Holding candidate numbers in mind exercises working memory, the mental scratchpad you use all day.

Better focus

Sudoku rewards sustained attention. Regular solving builds the habit of staying with a problem.

Calm & flow

The quiet, deliberate pace is a low-stakes way to decompress, a small daily ritual worth keeping.

How to play Sudoku

Sudoku is played on a 9×9 grid made of nine 3×3 boxes. The single rule: every row, column and box must contain the digits 1–9 exactly once. There is no arithmetic. Only logic. A well-formed puzzle, like every puzzle on this page, has exactly one solution that can be reached by deduction alone.

The four difficulty levels

Does Sudoku really help the brain?

Research links regular number-puzzle solving with maintained cognitive performance. A 2019 study in the International Journal of Geriatric Psychiatry (n≈19,000) found adults over 50 who regularly played number puzzles had brain-function scores equivalent to people ten years younger. Sudoku is also widely used in classrooms and care settings as a screen-friendly logic exercise.

How the puzzles are generated

Every puzzle on this site is made fresh on request. There is no stored bank of fixed boards. A backtracking algorithm fills a blank 9×9 grid, then removes clues one at a time. After each removal, the solver runs again to confirm exactly one valid solution still exists. The number of clues left standing at the end sets the difficulty. Reload the page and a new, fully verified board appears.

Frequently asked questions

There is no fixed number of Sudoku puzzles you should solve each day. For most people, solving one to three puzzles daily is enough to practice logical thinking, concentration, and problem-solving skills. Beginners may prefer easy puzzles, while experienced players can challenge themselves with medium or hard Sudoku puzzles. Consistent practice is generally more beneficial than solving many puzzles in a single session.

Sudoku and crossword puzzles train different cognitive skills. Sudoku focuses on logic, pattern recognition, and analytical thinking, while crossword puzzles emphasise vocabulary, language, and memory recall. Many people enjoy both because they provide complementary mental challenges. The best choice depends on your interests and the skills you want to practice.

Easy Sudoku puzzles are usually the best starting point for beginners because they introduce the basic rules and solving techniques without overwhelming complexity. Once players become comfortable identifying patterns and placing numbers correctly, they can gradually progress to medium and hard Sudoku puzzles.

Many people find that regular Sudoku practice helps them stay focused because the puzzle requires sustained attention, logical reasoning, and careful observation. While Sudoku is not a substitute for professional cognitive training, daily practice can provide a structured mental challenge that encourages concentration and problem-solving.

Common beginner mistakes include guessing without sufficient information, overlooking numbers already present in a row or column, and failing to scan the entire grid before making a move. Taking time to check possibilities systematically can help players solve puzzles more accurately and confidently. Here are our blog on sudoku tips and tricks.

Yes. SudokuPuzzleHub works on any phone or tablet. The grid, number pad and controls resize automatically to fit the screen. No app download, it runs in your browser.

Every puzzle is generated algorithmically using a backtracking solver, then verified to have exactly one valid solution before being served. Difficulty is controlled by the number and placement of given clues and the solving techniques required.

Yes. The Printable Sudoku section offers free PDF downloads including beginner bundles and large-print versions designed for seniors. Each PDF includes an answer key on the final page.

Each day a new puzzle is published. Completing it extends your daily streak, which is tracked in your browser's local storage, no account needed. The daily puzzle resets at midnight UTC.

Why Trust SudokuPuzzleHub?

SudokuPuzzleHub makes Sudoku accessible, enjoyable, and educational for players of all skill levels. Alongside classic Sudoku puzzles, we provide strategy guides, printable puzzles, and additional brain-training games such as Strands and Cryptogram.

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Three mistakes

That's Challenge mode for you. Want to keep going on this same board in Relaxed mode instead?