Play classic 9×9 Sudoku with four difficulty settings, Notes, Undo and explanatory hints. Each row, column and 3×3 box must contain the digits 1–9 once. Choose a smaller 6×6 practice board or open the dated daily puzzle, then compare candidate marks with completed entries.
Choose Sudoku for deduction from fixed numerical constraints. Compare it with Feudaly for one-per-region placement or Powderlab for sorting visible layers; they are different rules, not Sudoku variants.
In the checked Easy puzzle, row 4 contained 8,3,7,4 and 5. Its eighth cell was empty. The Hint explanation named 9 as the only digit that fitted. Another puzzle may start with different clues.
Before your next move
Counting a pencil note as a completed digit.
Checking only a row while ignoring the crossing column and box.
Assuming Undo refunds the hint already used.
Treating one checked placement as proof of a completed game or every daily rollover.
Browser edition
Play in your browser. No app download is needed.
Questions about Sudoku
What are the rules of Sudoku?
Fill the 9×9 grid with 1–9, with each digit appearing once in every row, column and 3×3 box. Starting clues are fixed. The 6×6 practice mode instead uses 1–6 and 2×3 boxes.
Do hints enter a number immediately?
In the checked example, Hint explained that only 9 fitted the highlighted cell. The counter changed from 3 to 2 when the explanation opened. Place then entered 9. Undo restored the empty cell, but did not refund the hint.
Are Notes the same as entering a number?
No. Notes write small candidate digits inside a cell. They express possibilities, not a completed placement. Turn Notes off to enter a full-size digit; Undo can reverse either action.
Does my puzzle save?
A normal page reload restored our placed 9, a candidate 2, elapsed time and two remaining hints in the same browser. This is local storage, not a promise of cross-device or permanent account saves.
Which modes are available?
The browser menu has Easy, Medium, Hard, Expert, Kids 6×6 and Daily. Daily displayed 29 October 2026 in the check. A midnight rollover and a complete manual win were not verified.
Original ManyPlay game. Controls and examples were checked against the browser edition; cover illustrations are labelled separately from gameplay captures. Report a changed rule or control.
