The VTech Marble Rush Corkscrew Set is a fantastic combination toy that engages first as a building challenge and then offers loads of interactive play. The pieces in this set are a good size for younger hands. With their bright colors, they are easily identifiable for assembly. The instructions are straightforward, and the level progression allows your little builder to ease into the system without being overwhelmed by the entire set. The connection points are easy to manage, and the structure is very steady; this helps avoid accidental tumbles and breaks. Each stage of the initial preset build provides an additional level of complexity and challenge, but all are age appropriate. Once built, the complete set offers hours of interactive fun. The functions of all the different moveable elements are brilliantly conceived. The light-up crank, the elevator, and all the various ramps and spirals provide unique ways to play with the set. Beyond the instructions in the booklet, other building designs are easily accessible online; this really extends the play value. But of course, the real fun comes when you can sit back and watch your little builder tap into their imagination as they start to freeform build. So if you have a child who loves building and cause-and-effect activities, this should be right up their alley.