Play Sudoku Online
Choose difficulty
- Notes: toggle to pencil small candidate digits into empty cells instead of answering.
- Hint: fills one cell with the correct digit.
- Erase: clears your digit or notes from the selected cell.
Solved!
What is Play Sudoku Online
Sudoku is a logic puzzle played on a 9x9 grid split into nine 3x3 boxes. You fill every row, column and box with the digits 1 to 9, never repeating one. This version generates a fresh puzzle every time across four difficulty levels, and every puzzle is guaranteed to have exactly one solution. Pencil notes, hints and a mistake counter help you through the tricky spots, and your best time is saved for each level.
How to use
- Choose a difficulty, from Easy (40 clues) to Expert (24 clues).
- Tap a cell, then tap a number on the pad or type 1 to 9.
- Turn on Notes to pencil in candidates before committing a digit.
- Use a hint if you get stuck, or erase a wrong number and try again.
- Fill the whole grid correctly to finish and beat your best time.
When to use it
Want a quick logic workout on your coffee break? Start on Easy with its 40 clues to warm up, then push to Expert's 24 clues when you want a real fight. Your best time is saved per level, so you always have a number to beat.
Frequently asked questions
What do the difficulty levels change?
The number of starting clues. Easy gives you 40 filled cells, Medium 34, Hard 28 and Expert 24. Fewer clues means more deduction before you can place a digit with confidence.
Does every puzzle have a single solution?
Yes. Each puzzle is generated by removing digits from a solved grid only while a unique solution remains, so there is always exactly one correct answer and never any guessing.
How do the pencil notes work?
Tap the Notes button (or press N), then tap numbers to pencil small candidates into a cell. Placing a real digit clears the notes there, and a correct digit is removed from the notes of its row, column and box.
Is my best time saved?
Yes, your best time for each difficulty is stored in your browser. It stays on the same device and browser between visits, with no account needed.
Can I play on my phone?
Yes. The grid and number pad are built for touch, so you can play on a phone or tablet the same way you would with a keyboard on desktop.
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