Track candidates and look for pairs or triples.
Touch · Mouse · Keyboard
Portrait game
Hard Sudoku gives 26 to 31 digits and asks for more than single candidates. Every puzzle needs pairs or triples: two cells in a row that can only hold the same two digits, or three cells that share three. Write notes, look for those patterns, and the rest of the grid opens up. Each puzzle still has one solution that logic reaches. For the toughest puzzles, try the expert level.
Starting a different board can replace the current unfinished puzzle. Read the confirmation if you have already made moves. Undo and candidate notes belong to the active puzzle, not every board in the catalogue.
The illustrated rules page contains the checked 9 placement, hint-counter change and reload example. A finished deal, a midnight rollover and physical-phone printing are not certified by these opening checks.
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.
Play in your browser. No app download is needed.
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.
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.
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.
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.
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.
