Yet another challenging collection of 175 Sudoku variation puzzles that cover our medium difficulty range of Sudoku puzzles categories! - Once you try these, your regular 9 x 9 Sudoku puzzles will become tame - guaranteed! You'll get 25 each of Suduko Twins, Triathlon (A & B - our favorites), Marathon, Samurai, 12 x 12s and 16x16 - thats 175 Suduko variants and variations - and their solutions! High quality paperback- far better quality than you normally see in magazine or newspaper publications - your ink will not bleed and it's difficult to wear holes when you erase incorrect answers! Handy size - easy to hold or put in your bag and take with you. Beautifully designed softback cover with matt finish that you'll enjoy taking out with you. Easy to read print with plenty of space for working on your puzzles. Solutions to every puzzle are included. Why don't you exercise your brain with the power of logic sudoku puzzles? They make great gifts for you family and Sudoku addicts - why don't you buy them one each!