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Daily Sudoku Generator – Online New Puzzle Every Day

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Daily Sudoku

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Frequently Asked Questions

What is Daily Sudoku?

Daily Sudoku provides a fresh, unique puzzle every single day based on the current date. Everyone playing on the same date and difficulty level gets the same puzzle, making it perfect for friendly challenges and comparing solve times with friends.

How are puzzles generated?

Our generator uses a seeded algorithm tied to the calendar date. This ensures the puzzle is deterministic—same date + same difficulty = same puzzle. Each puzzle has a unique solution verified by our solver. Advanced backtracking algorithms guarantee a fair and solvable challenge every time.

What do the difficulty levels mean?

Easy (≈43-46 given cells) – Great for beginners. Medium (≈37-41 given) – Requires basic strategies. Hard (≈31-36 given) – Needs advanced techniques like hidden pairs. Expert (≈26-30 given) – A true challenge for seasoned solvers requiring X-Wing, Swordfish, and other advanced strategies.

How do I use the Notes feature?

Toggle Notes mode (pencil icon) to mark candidate numbers in empty cells. In Notes mode, tapping a digit adds or removes that candidate. This is essential for tracking possibilities in harder puzzles. Turn Notes off to enter final answers. Notes appear as small digits in a 3×3 grid within each cell.

Does the tool save my progress?

Yes! Your progress is automatically saved to your browser's local storage. If you close the page and return later on the same day, your puzzle state, notes, and timer will be restored. Progress is saved per-date and per-difficulty, so you can switch difficulties and keep separate progress for each.

What are some basic Sudoku strategies?

Start with scanning rows, columns, and 3×3 boxes for numbers that can only go in one place. Then try cross-hatching – eliminate possibilities by checking intersecting rows and columns. For harder puzzles, learn naked pairs, hidden singles, and pointing pairs. Our Hint button demonstrates these techniques on your current board.

Can I print today's puzzle?

Absolutely! Use your browser's print function (Ctrl+P / Cmd+P). The puzzle prints cleanly with the grid and given numbers. You can also screenshot the board to share with friends. All puzzles are free and regenerated daily—no subscription needed.

Why is my number showing in red?

A red number means it conflicts with another number in the same row, column, or 3×3 box. Sudoku rules require each row, column, and box to contain digits 1-9 exactly once. Check for duplicates and adjust. Use the Check button to highlight all conflicts at once.

Pro Tips
  • Use Notes mode extensively on Hard and Expert puzzles to track candidates.
  • Look for rows, columns, or boxes that are almost complete—these often reveal easy placements.
  • The Hint function reveals one cell using logical deduction (not just the answer), helping you learn strategies.
  • Challenge yourself: try to beat your previous day's time on the same difficulty!
  • Playing daily improves your pattern recognition and logical thinking skills over time.
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