Between the two players, there is an upright grid formed by seven poles. The players now take turns inserting tube tiles which have different sides. While a tile might be advantageous because it connects tubes on my side, it might also help my opponent with the tubes on the reverse side - so it has to be carefully considered how to align a given tile. Tiles are randomly drawn from a bag. The first player to connect the base to the top of the grid on his/her side is the winner. (user summary by HilkMAN)