The dynamic board is what makes Vortex special. The rotating towers allow you to move your colour 'routers' in your preferred direction while at the same time countermoveing the ‘routers' of your opponents in the wrong direction, off course your opponents will do so as well.The unique concept of this game lies in the rotating towers. The basic game ‘Crossing' has a very clear purpose, getting your pieces across the board. As long as you're not in a minority position you may rotate the towers. The basic game can be played by two to six players and, due to its simple set off rules, this can be played at a very young age. A slightly more complex variant of this game ‘Crossing Advanced' allows you to use ‘controllers' to control the towers in other ways then by majority, this still can be played by two to six players. Two other possible varieties are ‘Solitary' and ‘Cat & Mouse', the first challenges you to (re)create order in chaos, at the second one the mouse tries to get passed the cats in order to get in the cupboard.