However, it's only currently for Steam and you need a Paradox account. Paradox announced that from now until April 26, anyone who signs up for their newsletter that already owns the base game will be eligible. With it you can build new amusement parks, nature reserves, city parks and zoos, and giving new life to your empty land with custom parks and gardens. It's one of the bigger DLCs available for Cities: Skylines and it's proven to be quite popular with players too. One of which, Cities: Skylines - Parklife, can be picked up free. Cities: Skylines is pretty much the gold standard of city building on any platforms and it has some good expansions too.