Does every puzzle have a single solution?

Yes. Each puzzle is checked to have exactly one solution, so you never need to guess.

Where is my progress saved?

Only in this browser. Nothing is sent to a server and no account is needed.

Fill the 9×9 grid so every row, every column and every 3×3 box contains the digits 1 to 9 exactly once.

Time 0:00Clues 33Date 2026-10-21

Follow these steps to get a result

Tap a cell, then tap a number (or type 1–9). Arrow keys move; Backspace erases.
Fill every row, column and 3×3 box with the digits 1–9, once each.
Turn on Notes to pencil in candidates. Red numbers clash with another in the same row, column or box.
Use Hint if you are stuck. Your progress and streak are saved on this device.

What this tool includes

Common questions about this tool

Yes. Each day and difficulty produces the same puzzle for every player, so you can compare times with friends.

Time zone rules come from the IANA time zone database; daylight saving changes are applied automatically. Methodology · Data sources