Techniques · sudoku
W-Wing
Two cells with the same pair {X,Y} are joined by a strong link on X. One of them must be Y, so cells seeing both cannot be Y.
In the walkthroughs, every W-Wing step shades the cells of the pattern and names the cell and digit it proves, so you can see the move on the grid rather than read about it. Press “Skip to next hard step” to jump straight to it.
Worked examples
Puzzles from the books where W-Wing is used. Each link opens the full step-by-step solution.
Extreme Sudoku 1 (84 of 150 puzzles)
- Puzzle 1 · Expert 5
- Puzzle 2 · Expert 5
- Puzzle 3 · Expert 5
- Puzzle 4 · Expert 5
- Puzzle 7 · Expert 5
- Puzzle 8 · Expert 5
- Puzzle 9 · Expert 5
- Puzzle 10 · Expert 5
Extreme Sudoku 2 (87 of 150 puzzles)
- Puzzle 1 · Expert 5
- Puzzle 4 · Expert 5
- Puzzle 8 · Expert 5
- Puzzle 9 · Expert 6
- Puzzle 11 · Expert 6
- Puzzle 12 · Expert 6
- Puzzle 13 · Expert 7
- Puzzle 15 · Expert 5
Extreme Sudoku 3 (76 of 150 puzzles)
- Puzzle 1 · Expert 5
- Puzzle 2 · Expert 5
- Puzzle 5 · Expert 5
- Puzzle 10 · Expert 5
- Puzzle 17 · Expert 5
- Puzzle 19 · Expert 5
- Puzzle 23 · Expert 6
- Puzzle 24 · Expert 6
Where it sits
See the whole ladder on hard sudoku techniques, or look a puzzle up by number under solutions.
