Free sample from Extreme Killer Sudoku 3: step-by-step solution

Print the puzzle first (PDF, A4 or US Letter), then come back and step through the solution, or skip to the hard parts.

Puzzle: Killer sudoku, the free sample for Extreme Killer Sudoku 3 (not one of its 150)
Difficulty: Expert 3 (expert and beyond)
Key technique: Finned Fish
Hard steps: 6 of 76 steps need an advanced or expert technique

Show pencil marks

Blue digits are placed by the walkthrough. Red strike-through marks a candidate being ruled out. Cells are named by row and column: R3C5 is row 3, column 5. Arrow keys step too.

The key technique: Finned Fish

An X-Wing or Swordfish with one extra candidate (the fin). Cells that are in the fish pattern and also see the fin lose the digit.

Every move above the basics is explained on the killer sudoku techniques page. The book's own 150 puzzles each have a page like this one: all Extreme Killer Sudoku 3 solutions.

The book

Volume three: 150 new killers, none repeated from books 1 or 2. No starting digits, just cages and their totals, ramping from hard to brutal.

On Amazon from 15 Dec About the book

Try a free sample puzzle (PDF) · prints on A4 or US Letter