Knock knock--who s there? With this delightful 1000-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--great for adults as well as children ages 12 and up. Melissa & Doug cardboard jigsaw puzzles are made using durable high-quality materials. The sturdy pieces--each uniquely shaped--resist peeling fading and creasing so the stunning high-gloss artwork will stay looking great for years to come! Puzzle play encourages goal setting and patience and provides hours of focused fun!