Stage 2 Four Seasons Educational Puzzle (2.5+ Years) | New Advanced Wooden Jigsaw for Kids | 7-Stage Logic Training (1-7 Years) | 9-20 Piece Growth Set | Includes Manual & Reward Stickers | Premium 5mm Plywood | Number Learning on Back | Non-Toxic Material | Interactive STEM Toy | Fine Motor Skills

• 【Perfect for 2.5+ Toddlers】 As the second stage of 7-level system, this set contains 9-20 large pieces (30% larger than standard), specially designed for toddlers' growing abilities. • 【Scientific Progressive System】 The complete 7-stage (1-7 years) series offers graduated difficulty. This growth level builds logic and spatial awareness through 9-20 piece puzzles. • 【Seasons & Numbers Learning】 Vibrant four seasons scenes develop observation, while backside numbers naturally teach counting during play - dual cognitive & math development. • 【Premium & Safe Material】 Made with 5mm thick plywood (2x thicker than average), anti-warping and durable. Rounded edges with EN71-certified non-toxic water-based paint ensure safety. • 【Complete Learning Kit】 Includes color manual for parental guidance and multiple reward stickers to motivate kids, making it perfect for quality bonding time while developing essential skills.