Sudoku

0:00

Paused

Arrow keys move between cells. Type 1 to 9 to fill a cell, with Shift or Alt for a note. N switches notes on and off. Backspace erases.

New puzzle

Daily puzzle

Leaving this puzzle unfinished counts it as a loss.

Enter a puzzle

Type or paste the 81 cells row by row: digits for clues, and 0 or . for blanks. Spaces, line breaks and grid lines are ignored, so a copied grid works.

How to play

Fill every empty cell with a number from 1 to 9.
Each row, each column and each of the nine boxes holds every number exactly once.
Every puzzle has exactly one solution, and you can always reach it by reasoning alone: no guessing.

Playing

Tap a cell, then a number. Or switch Settings to number first: pick a number, then tap every cell it goes in.
Notes (the pencil, or N) jot down the numbers a cell could still be. Placing a number tidies it out of the notes around it. A long press on a number also writes a note.
Hint starts with a nudge; press again to see the idea, and again to make the move. Hints work from your grid, notes and all.
Show me how (in the menu) lets the computer play on from where you are, explaining every step.
Your puzzle is saved as you play, so you can close the page and come back.

Keys

`1`–`9`	Fill the cell	`Shift` or `Alt` + number	Note
`←→↑↓`	Move	`N`	Notes on/off
`Backspace`	Erase	`H`	Hint
`U` `Ctrl Z`	Undo	`Y`	Redo
`P`	Pause	`D`	Show me how
`F`	Fill in all notes	`M`	Sound on/off

Levels and techniques

A puzzle's level is the hardest technique it needs. The hints name them as they come up.

Settings

Look

Theme

Numbers

Light up the row, column and box Light up matching numbersAnd notes, in number-first mode

Play

Entering numbers

Mistakes

Tidy notes when placing a number Hide numbers once all nine are in Left-handedNumbers on the left on wide screens Timer Sound effects Animation

Statistics

Sudoku

Solved