The book contains over 450 Nurikabe puzzles. This book contains Nurikabe in 3 different sizes: 156 5 x 5 Nurikabe puzzles, perfect to get started with. 150 10 x 10 Nurikabe puzzles, ideal for those confident with Nurikabe. 152 15 x 15 Nurikabe puzzles, for the experienced Nurikabe players. Something for everyone. Full solutions included in the back of the book."