Ahoy! You're an accidental pilot aboard a submarine that's sinking fast! Solve the puzzles to take control and navigate safely back to land. Devised by an expert on brain training, these mental gymnastics-and a friendly dolphin-will see you through your ocean adventure! You can't skip a puzzle, but there are hints to help and full answers to get you on your way. | Ocean Puzzles by Gareth Moore, Paperback | Indigo Chapters