Cities in Motion is a game about transporting people within a single city. You are doing this by building trams, buses, metros and boats. This is in difference to games like Railroad Tycoon, Transport Tycoon and most recently Train Fever where you transport people and goods between cities.
The base premise of the game works well with a well executed economy and people having regular destinations and are able to use several different lines to get to those destinations.
The game offers a pretty limited set of trams, metro trains, buses and boats. As far as I can make out if you want more you have to buy DLC:s.
The game has a campaign that is reasonable and also acts as a tutorial. It is not very special though.
Although it is possible to build a profitable tram network, if you want to make as much money as possible, it is almost always best to borrow money to build a couple of metro lines, which will make you enough money to build more metro lines. This makes the game a little bit more boring since not all options are viable.
The ingame time is something pretty confusing, since all lines take strange amount of time. It is easy to build 12 hour lines even in quite small city. And passengers are often quite happy to go to work in lines that take several hours. It leaves the impression that people in these cities are spending all of their time transporting themselves.