Book excerpt: Welcome to the 9 Circles of Sudoku Hell! From Merciless to Maddening to Murderous, this is a book to challenge even the most seasoned Sudokuist. By the end of this book, you'll be a Sudoku Genius. With 144 puzzles (and solutions) and an advanced strategies master class from puzzle expert Tom Sheldon, Sudoku Genius includes logical strategies such as: · The Force (and its variant, the Pincer) · Channeling · Completing the Square With these strategies in your arsenal, you'll have everything you need to solve these puzzles--if you dare to take the Genius challenge.