Portable puzzle featuring 15 plastic gears in 3 sizes for solving 40 challenges; 4 levels of difficulty – easy, medium, hard, extra hard; includes storage bag for easy on-the-go fun. Slide challenge card under the grid, place gears as illustrated; use indicated gears to connect yellow gear to the red gear; puzzle is solved once all gears are able to spin together; player must use all gears printed on the puzzle card. A fun challenge for kids and adults; high quality plastic materials built for lasting durability; gears fit easily into slots of grid, connect precisely for smooth spinning; pieces are lightweight yet sturdy and safe. Encourages problem-solving, critical thinking, concentration; young kids learn basics of how gears are able to connect and spin together; challenges logic skills, creative thinking; hard work rewarded with the vibrant thrill of spinning gears. Made in china; packaged in easy-to-open box; highly portable puzzle board doubles as storage case for challenge cards.