Entertain and challenge your brain with these nurikabe puzzles ( volume 1 ) ! The perfect way of improving mental agility, and problem-solving skills! Features: - 1 puzzle per page; - 80 16x16 total puzzles; - Great for kids, adults & seniors; - Hours of mind-sharpening fun; - Solutions included at the end; - Perfect size, 6” x 9” (15 x 23 cm); - Flexible premium paperback; - Printed on high-quality white paper; A great way for relaxing, stress relief and having fun! Perfect gift for activity and puzzle book lovers!