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How To Play Sudoku

In each Sudoku puzzle you have a 9×9 grid, divided into nine 3×3 blocks.

So each row, column or block contains nine cells You. start a Sudoku puzzle with some cells already filled in with numbers.

You can't change these numbers. The more cells are pre-filled the easier the puzzle.

How to play Sudoku

Fill the Remaining Cells

Now you just need to fill the remaining cells with numbers from 1 to 9, obeying the only rule:
Each row, column or block must not contain repetitive numbers.

STEP 1Look for empty cells
2
4
6
7
5
1
8
3
7
2
5
4
8
8
2
3
9
6
5
1
4
6
3
➜
STEP 2Fill the cells using the rule
2
4
6
7
5
1
8
3
9
7
2
5
4
7
8
1
8
2
3
9
6
5
1
4
6
3

The Goal

So each number from 1 to 9 occurs only one time in each row, column and block.

You Can Do It!

Sounds like a tricky task? Just start scanning the board and you'll find all clues you need, one by one, and get the puzzle solved.

Grid Scan

The more advanced technique you can use for a harder puzzle called 'scanning': it exploits the fact that any given number from 1 to 9 can occur only nine times in a completed Sudoku puzzle.

2
4
6
7
5
8
9
7
9
4
2
5
5
8
2
1
4
7
4
1
5
8
2
9
6
5
1
5
9
6
4
8
5
2
3
8
5
3
13
26
32
45
57
63
73
85
94
Fast input

Scan the grid for the number 5

Now draw a horizontal and vertical line from every 5 on the grid (you remember you can't place another 5 in a row or column) — it will quickly become clear there are almost no cells left where you can actually put it.

Grid scan diagram for number 4

Draw a horizontal and vertical line from every 5 on the grid.

You remember you can't place another 5 in a row or column — it will quickly become clear there are almost no cells left where you can actually put it.

STEP 1Draw lines from every 5
Step 1 - Draw lines from every 4
STEP 2Cells for 5 are eliminated
Step 2 - Cells for 4 are eliminated
5
Given 5
Lines from
every 5
(row & column)
Cannot
place 5
5
Only possible
cell for 5

Smart Tools. Smarter Solving.

Use handy tools like Notes, Undo, Erase and Settings to solve Sudoku with confidence.

1
4
2
7
3
5
9
7
4
8
2
6
3
4
1
7
4
5
2
6
1
6
8
7
3
9
8
1
4
3
7
4
1
6
5
9
7
7
123
4
6
4
3
9
7
6
8
Undo
Redo
1Click the note icon to enable pencil mode
Note
Erase
Settings
3Use Undo & Erase to fix mistakes easily
14
26
34
42
56
63
71
85
95

PENCIL (NOTES)

Click the note icon to enable pencil mode. Add small notes in the cells to mark possible candidates.

FINAL MODE

Click the note icon again to switch to normal mode and place big final numbers.

UNDO & ERASE

Made a mistake? Use Undo to revert your last move or Erase to clear any cell easily.

SETTINGS

Open Settings (gear icon) to explore error highlighting modes and find candidates faster.

POWER UP WITH SETTINGS

Try different error highlighting modes to
quickly spot mistakes and find the right
candidates.

Show Errors

Highlight conflicting numbers

Show Duplicates

Highlight duplicates
in rows, columns
and boxes

Highlight Candidates

See possible candidates clearly in each cell

Auto Check

Auto check entries as you play