Kumon Step-Up Jigsaw Puzzles Step 1Jigsaw puzzles help children develop concentration and working abilities, allowing them to learn while they play. This set comes with 8 puzzle boards that gradually increase in difficulty. The first puzzle starts with only 2 pieces, and the number of pieces gradually increases as children progress. How to Play Children complete the puzzles by fitting the pieces together to form animals or vehicle images. The difficulty increases step by step as the