This book of 1,000 puzzles contains classic sudoku as well as variants, all compiled into an easy-to-read format, most in 14-point font, with a complete index of solutions. Features a full range of difficulty levels: 200 easy, 400 medium, 300 hard, 60 challenge, and 40 super challenge puzzles that will keep you busy for countless hours. These puzzles are tedious, challenging and gratifying to complete. This one-inch thick perfect bound book is also available in other binding formats, such as spiral-bound or 3-ring binder from Cool Things Press.