https://www.pcgamer.com/pubgs-50-player-deathmatch-mode-is-back-after-bluehole-fixes-server-troubles/

PlayerUnknown's Battlegrounds Desert Knights mode, a 50-player deathmatch between ten teams of five players, lasted less than 24 hours when it launched two weeks ago. It was meant to run for three days, but developer Bluehole pulled the plug early because it was messing up the game's servers. After ironing out those issues, the mode is back, and it'll run until the end of this weekend.

Desert Knights, the latest of PUBG's deathmatch-like War modes, takes place in a small blue zone on Miramar that never changes size. If you die, you'll respawn from one of the planes that fly overhead every 40 seconds.