Kumon Step-Up Jigsaw Puzzles Step 3Jigsaw puzzles help children develop concentration and working skills while learning through play. This set comes with 3 puzzle boards, each increasing in difficulty. The first puzzle starts with 24 pieces, and the number of pieces gradually increases with each step. How to Play Children complete the puzzles by putting the pieces together to form animal, vehicle, or train pictures. The difficulty level progresses step by step as the number of pieces