The game publisher continues to wage war in its bid to get its mobile games on smartphones without the help of Apple and Google's storefronts.

While it’s turned on, it automatically keeps users from installing apps unless they come from “authorized sources” — namely, Google and Samsung’s app stores. Epic claims there’s no process for any rival store to become “authorized.

Fortnite” video game maker Epic Games on Monday accused Alphabet’s Google and Samsung, the world’s largest Android phone manufacturer, of conspiring to protect Google’s Play store from competition. Epic said it would file a lawsuit in U.