Sudoku puzzle generator and solver with auto-generated valid puzzles, hint system, and error highlighting
Place the numbers 1 through 9 so that every row, column, and 3×3 box contains each digit exactly once. Sudoku is pure logic, no math required, no guessing needed. From gentle warm-up puzzles to fiendishly difficult grids, there is always a challenge waiting.
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Slide numbered tiles to combine and reach 2048! Features touch/swipe support, undo functionality, and score tracking
Code-breaking puzzle game. Guess the secret color code with feedback pegs. Three difficulty levels
Classic minesweeper with right-click flagging, timer, first-click safety. Beginner, Intermediate, Expert modes
A cell’s row already contains 1-5 and 7-9, and its column and box rule out nothing further.
Cell candidates
Row has {1,2,3,4,5,7,8,9} → only 6 is missingResult
The cell is forced to 6 (naked single)
A "naked single" is the simplest deduction: when a cell has exactly one remaining candidate it must take that value, with no guessing. Chaining singles, hidden singles, and locked candidates solves most puzzles purely by logic, the solver verifies a unique solution exists.
Place the numbers 1 through 9 so that every row, column, and 3×3 box contains each digit exactly once. Sudoku is pure logic, no math required, no guessing needed. From gentle warm-up puzzles to fiendishly difficult grids, there is always a challenge waiting.
A daily Sudoku puzzle keeps logical thinking skills sharp and provides a satisfying routine.
The deep concentration required makes Sudoku an effective way to practice sustained focus.
Works offline after loading, perfect for flights or commutes.
Sudoku teaches deduction and elimination in an accessible, non-intimidating format.
Solving Sudoku relies on scanning for forced placements, using elimination within rows, columns, and boxes, and applying techniques like naked pairs and hidden singles as puzzles get harder. The satisfaction of completing a tough grid through pure reasoning is unmatched. Multiple difficulty levels ensure both beginners and experts find puzzles that stretch their skills.
Not at all. Sudoku is about placement logic, not arithmetic. You could use letters or symbols instead of numbers.
No. Every well-constructed Sudoku puzzle is solvable through logic alone.
Error highlighting will flag conflicting numbers so you can correct them. You can also undo moves.
Easy puzzles can be done in 5-10 minutes. Expert-level grids might take 30 minutes or more.
The game runs entirely in your browser. No account is needed and no gameplay data is collected.