Knock knock—who’s there? With this delightful 1,000-piece cardboard jigsaw puzzle, you’ll enjoy exploring dozens of doors of all shapes and colors. The high piece count makes for a more challenging puzzle experience—it’s fun for adults as well as children ages 12 and up. Melissa and Doug’s cardboard jigsaw puzzles are made from durable, high-quality materials. The sturdy pieces are each distinctly shaped and resist peeling, fading, and creasing, so the stunning high-gloss artwork will stay looking great for years to come. Puzzle play is an exceptional way for children to develop cognitive, physical, and emotional skills. As children work at solving the decorative and themed puzzles, they are also developing problem-solving skills, resilience, and confidence. The Melissa and Doug Knock Knock Cardboard Jigsaw puzzle makes an exceptional gift for kids ages 12 years and up. Add the 200-piece Melissa and Doug Underwater Oasis Puzzle to round out the hands-on, screen-free experience. For more than 30 years, Melissa and Doug has created beautifully designed imagination- and creativity-sparking products that NBC News calls “the gold standard in early childhood play.” We design every toy to the highest quality standards, and to nurture minds and hearts. If your child is not inspired, give us a call and we’ll make it right. Our phone number is on every product. Gender: unisex.