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GraviTrax - the innovative modular system for challenging marble runs. From a variety of different building blocks and rails, action-packed routes can be planned, tested and implemented with clever use of the laws of physics. With the numerous expansion sets, the free building and construction of the innovative GraviTrax construction system becomes even more interesting and exciting every time! More options - more fun! With the spiral element, marbles can overcome particularly great heights. The spiral can be assembled individually in height and thus perfectly adapted to a track. This element, when combined with a starter set or integrated into an already constructed GraviTrax world, brings a whole new momentum and many new possibilities.