https://www.gamespot.com/articles/gta-5-online-update-adds-battle-royale-inspired-mo/1100-6458957/

Rockstar has rolled out another batch of content for Grand Theft Auto V. Along with a new selection of in-game bonuses and discounts, the developer has introduced a new, battle royale-inspired Adversary mode for GTA Online called Trap Door, which is available to play now on PS4, Xbox One, and PC.

Trap Door pits teams against each other on a floating platform that is shrinking "rapidly" throughout the match. Each time a player is killed, they are transported to the red zone, where they're given only a few seconds to escape to the main platform before the zone disappears and dumps everyone within into the ocean.