Kumon Step-Up Jigsaw Puzzles Step 2Doing jigsaw puzzles helps develop concentration skills and learning abilities while playing. Each set comes with 4 puzzle boards, arranged in order of difficulty. The first board starts with 9 pieces, and the number of pieces gradually increases. How to Play Players complete the puzzles by putting the pieces together to form pictures of different animals, vehicles, or trains. The difficulty level progresses step by step as the number of pieces