★★This collection of puzzles is bound to keep you busy for hours on end!★★Includes 3 difficult levels ranging from hard, difficult to extreme.Complete answers are located at the back of the booBuild your logic & problem-solving skills while having fun along the wayMakes a great Gift! For the sudoku puzzle lover, this books makes a great gift for any occasion! Birthday, stocking suffers, road trip or more, everyone will love it!