The GraviTrax PRO Vertical Starter Set is an absolutely brilliant and ingenious toy/game/construction set. For those who regularly check out our Seal reviews, you’ll know that the original version of Gravitrax has been awarded the Seal. Well, Ravensburger has upped their game, and our parent testers were blown away. If you are familiar with marble maze toys, you’ll have some idea about what you will find inside the beautifully designed box. Before we get into the details of the play experience, we must note the eye-catching motif. The use of green, gray, and white, which are gender-neutral, are also very modern and futuristic. Even the colorful marbles have a great shine to them and are kind of mesmerizing as they glide through the track your child builds. That brings us to the experience. First, you will want to recreate some of the designs found in the impressive instruction manual. You’ll build a few of those, and then you’ll start tinkering, and that’s where the magic came alive for so many of our younger testers. There really are no limitations to what you can do. With available add-on packs, the possibilities are truly endless. Parents believed that all their children’s senses were engaged and focused on either following the instructions for the suggested builds or letting their creativity take over. According to our testers, this is not an inexpensive toy, but it is well worth the investment. Perhaps it can be the big toy under the tree this season.