Volume 3 of the highly successful Killer Samurai book. This book contains 75 of the most challenging Sudoku variation puzzles - Killer Samurai. First 70 puzzles are what you are already used to find in this series; the final 5, however, are a novelty: 5 Killer Samurai with all four operators (+, -, * and /). All in all, you get 25 easy, 25 medium and 25 hard puzzles.