Cities: Skylines is a city-building game in which players assume the role of urban planner, building roads, zones, parks, and other urban infrastructure. They are able to design and build cities in an infinite environment, where they are not restricted in any way.

The environment is open and the maps are not limited. In this mode, players have to take care of the city, building roads, parks, gardens, and other urban infrastructure. They have to manage the urban environment, which is the most important part of the game.

Cities: Skylines also has a sandbox mode, in which the players are not restricted in any way. In this mode, players can build and develop the city in an infinite environment, where they are not restricted in any way.