Sudoku Game – FAQs
Basics
Q1. What is Sudoku?
Sudoku is a logic puzzle where you fill a grid so each row, column, and subgrid contains all symbols (1–9 for 9×9) without repeats.
Q2. How do I play Sudoku online here?
Pick a grid size, choose a difficulty, then tap/click a cell and enter a number. Use pencil marks for candidates, and the eraser to clear.
Q3. What grid sizes are supported?
From 4×4 up to 36×36, including 9×9 (classic) and large boards like 16×16, 25×25, and 36×36.
Q4. What are the basic rules?
No repeats in any row, column, or subgrid. Fill the whole grid using logic—no guessing needed for valid puzzles.
Features & Controls
Q5. Do you offer hints?
Yes. Hints reveal a logically deducible move without spoiling the whole puzzle.
Q6. Is there an undo/redo?
Yes. Undo mistakes step-by-step and redo if needed.
Q7. Can I use pencil marks/notes?
Yes. Toggle Notes to add small candidates in a cell.
Q8. Do you have a timer and statistics?
Yes. Track time, mistakes, streaks, and personal bests.
Q9. Dark mode available?
Yes. Switch between Light and Dark for comfort.
Q10. Can I pause a game and resume later?
Yes. Your progress auto saves in the same browser/device.
Difficulty & Puzzle Quality
Q11. What difficulty levels are available?
Easy, Medium, Hard, Expert. Harder levels require advanced logic and fewer given clues.
Q12. Are puzzles unique and solvable by logic?
Yes. Each puzzle has one unique solution and is designed for logical solving.
Q13. What is Killer Sudoku?
A variation where “cages” have sums; digits can’t repeat inside a cage, and standard Sudoku rules still apply.
Q14. Do you validate large sizes (16×16, 25×25, 36×36)?
Yes. All sizes follow correct subgrid rules and are validated for uniqueness.
Tips & Learning
Q15. Best strategies for beginners?
Start with singles (naked/hidden), use pencil marks, scan rows/columns/subgrids, and avoid random guessing.
Q16. How can I get faster?
Practice candidate marking, learn pairs/triples, pointing/claiming, X-Wing, and keep mistakes off using notes.
Q17. Is guessing allowed?
You can, but it’s not needed for our logic-solvable puzzles and may lead to errors.
Printing, PDF & Sharing
Q18. Can I print puzzles and solutions?
Yes. Use the Print/PDF button to export puzzle and solution.
Q19. Can I download a PDF set?
Yes. Choose “Export to PDF” for a single puzzle or batch (where available).
Accounts & Devices
Q20. Do I need an account to play?
No. Play instantly. An account (optional) can sync stats across devices.
Q21. Does it work on mobile?
Yes. The UI is optimized for phones, tablets, and desktops.
Q22. Will my data sync between devices?
With an account: yes. Without it: progress stays on the current device.
Troubleshooting
Q23. Numbers won’t enter—what do I do?
Check if Notes mode is on, make sure the cell isn’t fixed, and reload if needed.
Q24. The puzzle seems impossible —bug?
Use “Check Mistakes” or “Validate” to find errors. Our puzzles are uniquely solvable.
Q25. Keyboard shortcuts available?
Yes. Use 1–9 (or A–Z for big grids), Backspace to erase, N for notes, U/R for undo/redo (if enabled).
Customization & Extras
Q26. Can I switch to letters (A–Z) for big grids?
Yes. Toggle Number/Alphabet mode for sizes above 9×9.
Q27. Do you have daily challenges?
Yes. Play the Daily Sudoku and track streaks.
Q28. Can I load my own puzzles?
For advanced users: you can import JSON or paste a grid (where supported).
Q29. Do you show mistakes automatically?
Optional. Enable/disable “Show Mistakes” in settings.
Q30. Is there an ad-free or premium version?
If offered in your region, you can upgrade for an ad-free experience and extra features.
