Techniques · killer sudoku
Multi-Sector Locking
A digit the cage must contain can only go in one row, column or box, so it is ruled out of the rest of that row, column or box (or the other way round).
In the walkthroughs, every Multi-Sector Locking 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 Multi-Sector Locking is used. Each link opens the full step-by-step solution.
Extreme Killer Sudoku 1 (110 of 150 puzzles)
- Puzzle 4 · Expert 2
- Puzzle 5 · Expert 3
- Puzzle 8 · Expert 3
- Puzzle 9 · Expert 3
- Puzzle 10 · Expert 4
- Puzzle 12 · Expert 3
- Puzzle 13 · Expert 3
- Puzzle 15 · Expert 3
Extreme Killer Sudoku 2 (113 of 150 puzzles)
- Puzzle 2 · Expert 2
- Puzzle 3 · Expert 2
- Puzzle 4 · Expert 3
- Puzzle 5 · Expert 3
- Puzzle 6 · Expert 3
- Puzzle 9 · Expert 3
- Puzzle 10 · Expert 2
- Puzzle 12 · Expert 2
Extreme Killer Sudoku 3 (123 of 150 puzzles)
- Puzzle 1 · Expert 2
- Puzzle 2 · Expert 2
- Puzzle 4 · Expert 2
- Puzzle 5 · Expert 2
- Puzzle 7 · Expert 2
- Puzzle 8 · Expert 4
- Puzzle 9 · Expert 4
- Puzzle 11 · Expert 3
Where it sits
See the whole ladder on hard killer sudoku techniques, or look a puzzle up by number under solutions.
