Here you can find all Codes for 2021 Advent Calendar. I put them with URL Code, so it will automatically load in GraviTrax App. CORE: Simply be creative is the plan here: with uncomplicated building elements that can be used intuitively and in a variety of ways and where kids from the age of 8 have fun trying things out and getting started. All beginnings are easy! GraviTrax CORE, PRO or POWER? Preferably all three, of course. But one thing at a time. First of all, we would like to introduce the three different GraviTrax lines here and answer the most frequently asked questions: Which GraviTrax products are suitable for beginners? What is the difference between GraviTrax PRO and POWER? From what age can you start having fun with GraviTrax?