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 was originally scheduled for release in the first quarter of 2009, but is now set to be released on September 3, 2009 in French and German.The game allows players to play online and interact with others on massive persistent planets, to work together to shape cities, manage the economy and care for the needs of city inhabitants. Players can also play in a single-player mode.