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!