Plot: ZombsRoyale.io is a 2D battle royale video game developed by an American studio, End Game. It was released on 2018 for iOS, Android and on web browsers. Wikipedia
Plot: Surviv.io is a browser based multiplayer online 2D battle royale game created by Justin Kim and Nick Clark. It was released in October 2017 for browser, and in October and November 2018 respectively for iOS and Android devices. Wikipedia