The Dr. that my mother -in- law works for is so generous and sent the boys this awesome kit to make with their grandfather. It builds 11 different models. Today they decided upon a bulldozer. It was fun to watch them all interact and work together to build and solve problems that may have encountered. Then they were able to make it move with a remote. It actually pushed things around. The boys think it is pretty cool and are thinking about what they will build next. Unfortunately, it will have to be without their Grampy's help.