Perfect for science centers or a gift, this activity set helps introduce STEM concepts in a fun, hands-on way. The colorful buttons on the mouse match the coding cards so they can build their sequencing skills and translate that into STEM skills. Includes: 16 maze grids, 22 maze walls, 3 tunnels, 30 double-sided coding cards, 10 double-sided activity cards, a cheese wedge, the mouse and an activity guide. Plastic. (83 pcs. per set) Maze board, 20" x 20"; mouse, 4". Requires 3 "AAA" batteries, not included.