The Building Blocks 123 Puzzle Train is an educational toy that combines the fun of building blocks with the learning of numbers. This puzzle train set includes building blocks in the shape of numbers 1, 2, and 3, allowing children to practice counting and basic math skills while playing. The blocks can be assembled to form a train, adding an element of imaginative play. With its book format, this puzzle train is not only entertaining but also helps children develop fine motor skills, problem-solving abilities, and cognitive skills.