GraviTrax is the flexibly expandable and interactive marble run system for children aged 8 and over. With GraviTrax, entire marble run worlds can be created. All GraviTrax products in the three lines GraviTrax, GraviTrax PRO and GraviTrax POWER can be combined with each other. An ideal gift not only for birthday for boys and girls. GraviTrax PRO allows additional dimensions with multidimensional elements for even more tricky tracks. Thanks to the interactive game mechanisms, there are even more variations that require strategic building of the tracks. For those who are ready for the next challenge to build even more spectacular. The element releaser of the GraviTrax PRO line connects three levels together. In the course of the track, the stone can be loaded with balls in the top level. Continuous balls in the lowest level release the balls waiting above back to the middle level. Manual charging is not necessary. With this element, dependencies between the ball runs over three levels must be planned and taken into account. Rolling balls take a waiting position at the top level and wait for later release. The corresponding output on the middle level can be individually adjusted in several directions. Here the player determines the difficulty level. The more balls pass through the releaser, the more challenging the path to be constructed. Cleverly installed, chain reactions can be created and the releaser can be used as a ball retarder and trigger. A firework of bullet expolsions can be created.