Here's a collection to entertain the most ardent number puzzle fan. The puzzles included have been selected to offer a challenging and satisfying solving experience, and include many popular types including sudokus, kakuros, calcudokus and skyscrapers. Enjoy finding puzzle types you know and love and discovering new ones too! EXERCISE YOUR BRAIN: Give your mind a great workout as you find the solutions. REDUCE STRESS: Feel your stress melt away as you focus on these satisfying puzzles. IMPROVE YOUR SOLVING SKILL: Enjoy the satisfaction of seeing your skill improve as you work through the book and you become quicker at solving the puzzles.