This game has fairly simple goals, interface and mechanics.... and is Exceptionally Good at all of them. In short, you are to keep your city's metro system active and efficient, delivering people in a timely manner to their locations, designated by symbols. Each map starts easy then ramps up in difficulty fairly quickly. Throwing spanners in to the works are the random choices in between weeks as to what upgrades you may utilise in the future, as well as some of the locations changing their symbol (changing up your network's bottlenecks). This game definitely has the "Just One More Go" factor. By far, the most addictive game I have played this year. The minimialist interface and audio truly work well for the game too. Highly Recommended, particularly if you are a fan of constructive and/or puzzle games.