User Summary Mini Metro tasks the player with building an metro rail network of gradually increasing complexity. Passengers arrive at a station with an intended destination represented by a symbol. The player starts with three lines that they can use to connect stations. Over time, new stations spawn that the player needs to connect to their network. Every seven days the player is offered the choice three randomly selected upgrades (additional lines, double rails, station upgrades, more tunnels, increased passenger capacity, etc.) in order to cope with the growing demands upon the network. Play proceeds until the player is no longer able to service the passenger demands and waiting passengers overflow at one or more stations.