Free practice

Sudoku

Nine numbers. Room to take it step by step.

Three puzzles to choose from

Activating the board… If it does not start, reload the page and check that JavaScript is enabled.

Puzzle 138 of 81 cells filled

5				4	9	3	8	6
		3		5		7	9
	9		3
1			9	7	5			3
7			8	3	4
3	4	8	2					7
	1		4	8
8	7		6	2				9
				9		4	7	8

Select an empty cell to begin.

Only one puzzle is saved in this browser, with no syncing between devices. Clearing site data or closing a private browsing session may delete it.

Bold numbers: starting numbers. Underlined numbers: your entries. ! sign: duplicate number.

Controls and feedback

Tap a cell and choose a number. Keyboard: arrow keys to move, 1–9 to enter a number, Delete or Backspace to erase. Home and End move across the row; Ctrl + Home or End move across the board. Tab leaves the board.

Starting numbers cannot be erased. You can change your entries and undo the last 200 moves, even after resuming. Warnings highlight duplicates without comparing every move with the solution: a number with no warning may still need correcting later.

How to play Sudoku

Fill the board with the numbers 1 to 9. Each number must appear exactly once in:

Each horizontal row.
Each vertical column.
Each of the nine 3 × 3 boxes.

A deduction to get started

If a row already contains 1, 2, 3, 4, 5, 6, 7 and 8, its only empty cell needs a 9. Before entering it, also check its column and box.

Sudoku

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How to play Sudoku

A deduction to get started