https://phys.org/news/2018-05-raging-fortnite-esport-game-mn.html

"Fortnite" became an eSports phenomena after the release late last year of a "Battle Royale" mode that lets up to 100 players vie to be the last character standing on ever-shrinking terrain.

Players can survive by working with allies, or hiding, but the boundaries of arenas contract with damage inflicted to characters who remain outside.