Epic Games Store Holiday Sale is on with 15 days of free games and up to 90% discount - get Cities: Skylines free or GTA V: Premium Edition at half price Cities: Skylines is available for free on the Epic Games Store until Dec 18. (Image source: Paradox) The Epic Games Store Holiday Sale has started and there will be 15 days of free games incorporated into the offers available. Cities: Skylines is the first free game that is now available for download until Dec 18. Big titles such as Assassin’s Creed: Valhalla, Immortals: Fenyx Rising, and the Premium Edition of GTA V are available to buy with attractive discounts.