Cities in Motion is a business simulation game developed by Colossal Order and published by Paradox Interactive. It was released for Microsoft Windows on February 23, 2011, with OS X and Linux ports coming at later dates. The goal of the game is to implement and improve a public transport system in 4 European cities - Amsterdam, Berlin, Helsinki and Vienna. This can be achieved by building lines for metro trains, trams, boats, buses and helicopters. The game is available for purchase on digital disc, download via Steam, and DRM-free download via various other distributors.