The Steam Workshop for mod-friendly city builder Cities: Skylines is stuffed with free goodies, and continues to grow by over a thousand new items per day. Are there any mods for steam city builder? Once you find a mod that you'd like to add to your game, simply click on the plus button to subscribe, and the mod will be automatically downloaded via Steam to your game. You can browse for mods via the Steam Community workshop either on your browser or through your Steam client. Frequently Asked Questions Where can i download mods for cities skylines?