Battle Royale games are played online against 100's of other players. They blend different genres of games: survival, exploration, adventure, shooting and scavenging while introducing the last-man-standing gameplay.
They are usually played in an arena where players start with basic equipment and aim to kill all the other players. The arena area shrinks as play proceeds to bring the game to a crescendo.
"The name for the genre is taken from the 2000 Japanese film Battle Royale, itself based on the novel of the same name, which presents a similar theme of a last-man-standing competition in a shrinking play zone." - Wikipedia
This list includes 3 games from the last 27 years, with 20 likes. They come from a range of different genres and play-styles and are all good games if you want to play battle royale online showdowns.