Cities XL (formerly Cities Unlimited) is a city-building simulation computer game under development by Monte Cristo, which has prior development experience in City Life. It is scheduled for release in the first quarter of 2009. The game allows players to shape cities, manage the economy and care for the needs of city inhabitants. Players can also take their game online and interact with thousands of others on massive persistent planets.
Cities XL combines both the city design aspect of plopping and the automated growth aspect of zoning to lay out a city. The Mass Placement Tool allows a player to select tags that define what they want to build in a zone, which adds control and flexibility. There are tags that describe a building's function, such as Residence, Commercial Service, Hotel, Industry, etc and other important characteristics such as size, level of wealth, architectural style, geographical origin, and so on. Moreover, each individual building is identified by a unique tag so that you can choose specific buildings. Players will also be able to create and define their own sets of custom tags.