Techniques · killer sudoku
Advanced Innies (3+ sectors)
The 45 rule over three or four rows or columns at once fixes a cell or the total of a small group of cells.
In the walkthroughs, every Advanced Innies (3+ sectors) 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 Advanced Innies (3+ sectors) is used. Each link opens the full step-by-step solution.
Extreme Killer Sudoku 1 (103 of 150 puzzles)
- Puzzle 3 · Expert 2
- Puzzle 5 · Expert 3
- Puzzle 6 · Expert 4
- Puzzle 7 · Expert 3
- Puzzle 8 · Expert 3
- Puzzle 9 · Expert 3
- Puzzle 10 · Expert 4
- Puzzle 13 · Expert 3
Extreme Killer Sudoku 2 (111 of 150 puzzles)
- Puzzle 2 · Expert 2
- Puzzle 4 · Expert 3
- Puzzle 6 · Expert 3
- Puzzle 9 · Expert 3
- Puzzle 10 · Expert 2
- Puzzle 11 · Expert 2
- Puzzle 12 · Expert 2
- Puzzle 13 · Expert 2
Extreme Killer Sudoku 3 (131 of 150 puzzles)
- Puzzle 1 · Expert 2
- Puzzle 3 · Expert 2
- Puzzle 6 · Expert 2
- Puzzle 7 · Expert 2
- Puzzle 8 · Expert 4
- Puzzle 9 · Expert 4
- Puzzle 10 · 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.
