Some video game publishers have abandoned a fixed pricing model for video games (where you purchase a video game at a set price) for a 'free to play' model. Free-to-play means the base game can be downloaded and played without charge. Revenue is generated through optional in-game purchases, which may include cosmetic items, additional content, convenience features or gameplay advantages, depending on the game. Examples of games that use the 'free to play' model include Fortnite, League of Legends, and Roblox. Games with a set price upfront include Skyrim, Animal Crossing, and Call of Duty.