In Key to the City: London, each player aims to develop their own London borough based around their home tile, using the large hexagonal location tiles.
Each location tile gives victory points and may generate resources (connectors which connect two location tiles and skill tiles). Connectors and skill tiles can be used to upgrade location tiles for additional victory points and productivity.
The game is played over four eras. In each era new location tiles will be available to be bid for. In both era 1 and 2 these tiles will comprise of six resource generating tiles, plus some additional building tiles. In era 3, there will only be building tiles, which will arrive already upgraded. In era 4 some of the Routemaster tiles will become available.