This is a very nice gift and fun to build, though once you've finished admiring it, you're left wondering quite what to do with it! As you can probably see, the tower is in three sections, lower, middle and top, with plastic platforms in between. We found the upper plastic platform simply would not seat itself properly on the middle section and this made the tower very wobbly and unstable. After a great deal of investigation we eventually found the trouble lay in the hinged, corner pieces of the jigsaw. It's really important to make sure these are firmly and fully bent into a 90-degree corner - quite hard to do for tiny fingers - otherwise the sides of the tower imperceptibly bulge out and the platform won't fit over them properly. I hope this helps someone.