Walkthroughs
Step-by-step solutions
Every logic puzzle in our books is solved here one move at a time: which cell, which digit, and the technique that proves it. Pick a book, then the puzzle number printed on the page. Each solution has a QR code to the same walkthrough, so you can also scan it from the book.
Extreme Sudoku 1
150 sudoku puzzles, 72 at Expert 5, 50 at Expert 6, 26 at Expert 7, 2 at Expert 8. Easiest first, hardest last.
Extreme Killer Sudoku 1
150 killer sudoku puzzles, 108 at Expert 2, 37 at Expert 3, 5 at Expert 4. Easiest first, hardest last.
Extreme Sudoku 2
150 sudoku puzzles, 50 at Expert 5, 50 at Expert 6, 50 at Expert 7. Easiest first, hardest last.
Extreme Killer Sudoku 2
150 killer sudoku puzzles, 121 at Expert 2, 27 at Expert 3, 2 at Expert 4. Easiest first, hardest last.
Extreme Sudoku 3
150 sudoku puzzles, 50 at Expert 5, 50 at Expert 6, 50 at Expert 7. Easiest first, hardest last.
Extreme Killer Sudoku 3
150 killer sudoku puzzles, 92 at Expert 2, 50 at Expert 3, 8 at Expert 4. Easiest first, hardest last.
Techniques
Each step names its technique. The hubs explain every one, from singles to forcing chains, with worked examples from the books: sudoku techniques · killer sudoku techniques · the full list. The toughest puzzles across the books: hard sudoku · hard killer sudoku.
Want to try one first? Every book has a free printable sample puzzle with its own step-by-step solution, and the walkthroughs page has a live demo that is in no book.