I really enjoyed putting this kit together , altho the pieces are very thin an fragile it definitely requires a lot of patients and care putting together . I found the use of needle nose pliers necessary to press many of the parts together to avoid breaking them . Even though they say no glue is needed , foresight tells me many of the parts will come loose before its completed , so I used small amounts of wood glue on most of the joints pressed together . Especially on the tracks an rails , wasn't necessary for the steel pins . Also needed glue on all the steps to keep the spiral track in place , once completed everything worked fine , works best on a level surface . Fun project if you take your time , but probably to fragile and complicated for younger children , some of the directions are a little vague and not quite clear .