A clear mind. One square at a time.

Sudoku Logic Lab

Settle into a well-made puzzle. Every generated grid has one solution, with helpful tools that leave you in control.

v1.1.0 · No ads in the game

Time0:00

Filled0 / 81

Hints used0

Choose an empty square, then a number.

Local save · Puzzle

Your pace. Your puzzle.

Difficulty

Hints distinguish a single possible candidate from a revealed answer. Difficulty reflects clue density, not a certified solving-technique grade.

How to play

Use each number 1–9 once in every row, column and 3×3 box. Select a square, then tap the keypad or type a number. Arrow keys move between squares; Delete erases. Fixed clues cannot be changed.

Space to think

Pencil notes, candidate guidance, a move history and a gentle check button help you work through the puzzle without a countdown.

Pause hides the numbers. The timer stops while paused or while this page is hidden.

Yours, on your device

The offline edition includes fresh puzzles in three modes and a shared daily puzzle seed based on the UTC date. Saves stay in this browser when storage is available.

No account, cloud save, ads or gameplay telemetry. Clearing browser storage removes your local save.