Engino's Discovering STEM set puts levers and linkages under the microscope, using 106 snap-fit pieces to build up to 16 working models. Kids construct machines like a seesaw, a movable weight scale, a wheelbarrow, a parking gate, a toy with moving figures, a pantograph, and two types of linkages, seeing firsthand how a lever multiplies force and how connecting several of them together produces complex motion. It's built for kids ages 9 and up who are ready to move past basic stacking and into real mechanical problem-solving.