I usually like such puzzler with simple rules, because they sometimes offer more potential than is assumed at first glance. Unlike but here: The game is pretty monotonous after a few levels - variety nil. It becomes more difficult over time only in that is on the pitch less space for the lines available, or you have to choose, for example, once a detour in color A, because otherwise for color B is no direct connection possible. There are also antiquated, jerky animations and a very basic background sound.
Various apps with style game, only a lot better to be implemented, has long offered free, such as the well-known and also more demanding Flow Free. Against this background, I can for router, even as today's free app of the day, to express no real recommendation. 1 to 2 stars.