Sudoku Flow
Sudoku Flow is a full-featured version of the classic 9x9 number puzzle. Every row, column and 3x3 box needs the digits 1 to 9 once each, and the starting clues give you a foothold.
Each grid opens right on the page, which makes it a good fit for a school Chromebook. Extras like notes, hints, timed modes and short technique lessons make it easy to grow from easy grids to hard ones.
How to play Sudoku Flow
Pick an empty cell, then type a digit or tap one on the number pad. Shaded cells are the given clues and cannot change. If a number repeats in a row, column or box, the conflict is highlighted and your mistake tally rises by one.
Turn on Notes to write small candidate digits in a cell. Selecting a filled cell highlights every matching digit, which helps you scan. Stuck? The Hint button offers help in steps.
Start a new game to choose a difficulty from Easy to Insane, or set your own clue count. Modes include Classic, Timed Rush, Zen, Hardcore and Infinite, and a Daily Challenge gives one shared puzzle per date. Your score starts at 2,000 and drops for mistakes, hints and time.
Controls
| Action | Keyboard | Mouse | Touch |
|---|---|---|---|
| Select a cell | Arrow keys | Click a cell | Tap a cell |
| Enter a digit | 1-9 | Number pad | Number pad |
| Erase | Backspace or Delete | Erase button | Erase button |
| Toggle notes | N | Notes button | Notes button |
| Hint | H | Hint button | Hint button |
| Undo / redo | Ctrl+Z / Ctrl+Y | Arrow buttons in the top bar | — |
| Pause or list shortcuts | P / ? | — | — |
Tips
- Look first for any row, column or box missing only one or two digits. Those cells fill themselves.
- Choose one digit and sweep the whole board for it, box by box, before moving on to the next digit.
- On Expert and Insane, pencil in candidates early. Pairs of matching notes stand out and remove options elsewhere.
- Each hint costs 50 points and each mistake costs 100, so a careful pause usually pays better than a guess.
- Open the Learn section for lessons on pairs, X-Wing and Swordfish once basic scanning stops working.
- Try Zen mode when you want to practice without pressure, then move to Hardcore once your mistake count stays low.
If you like Sudoku Flow, try these
Math Cage GridDigits with no repeats in a line stay the rule, but cages add sums and products you must hit.
Greater-Than GridLatin-square logic returns, with tiny greater-than signs guiding which digit goes where.
Questions
Does Sudoku Flow keep my stats?
Yes. Best times, your daily streak and other progress are stored in your browser, so they stay on that device until you clear site data.
How is the score calculated?
Each puzzle starts at 2,000 points. Every mistake removes 100, every hint removes 50, and each ten seconds of play removes one more.
Is there a dark mode?
Yes. The theme picker includes Light and Dark options, so you can switch to a darker board for evening play.
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