These MasterPieces 15" x 21" 500pc Hidden Image Glow-in-the-Dark Puzzles feature various ocean and wildlife scenes, each with special, hidden animals or objects, some of which glow-in-the-dark, and others who hide in plain sight. Take a dive down to the bottom of the sea with this gorgeous hidden images puzzle. A beautiful mermaid and her marine friends have discovered a treasure trove of pearls nestled on the ocean floor. Sit back and relax with this peaceful underwater scene. Find all the secrets in these wildly entertaining puzzles! To reduce their impact on our environment, the chipboard used in these puzzles is made of recycled material.