Boost counting and number sequencing skills with Numberblocks Sequencing Puzzle Set. The set includes five double-sided puzzles featuring Numberblocks from one to twenty. Start by building a five-piece puzzle with Numberblocks One to Five and gradually progress to the twenty-piece puzzle with Numberblocks One to Twenty. These colorful, self-correcting puzzles offer an engaging way to introduce counting and number order to kids aged 3 and up. Spark their curiosity and mathematical thinking with this fun and educational puzzle set. Key Features: Five double-sided puzzles for number sequencing. Introduces counting and number order in an engaging way. Colorful, self-correcting puzzles for interactive learning. Enhances mathematical thinking and cognitive development. Perfect for kids aged 3 and up.