Techniques · sudoku
Jellyfish
An X-Wing with four rows and four columns.
In the walkthroughs, every Jellyfish 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 Jellyfish is used. Each link opens the full step-by-step solution.
Extreme Sudoku 1 (2 of 150 puzzles)
- Puzzle 43 · Expert 5
- Puzzle 128 · Expert 7
Extreme Sudoku 2 (4 of 150 puzzles)
Extreme Sudoku 3 (2 of 150 puzzles)
- Puzzle 25 · Expert 6
- Puzzle 129 · Expert 7
Where it sits
See the whole ladder on hard sudoku techniques, or look a puzzle up by number under solutions.
