Trap Door

"Ever wake up and know it was going to be one of those days? Well this time it's not just a sinking feeling - you really are plunging hundreds of feet into the Pacific. Up to four teams compete on a rapidly shrinking arena. Take someone out and they restart in the red zone, with only a few seconds before they're just another drop in the ocean. Last team standing wins."

- In-game description

 is an Adversary Mode featured in Grand Theft Auto Online, as part of the Southern San Andreas Super Sport Series update, released on May 15, 2018, during the Trap Door Week event.

Overview
"The brand new Trap Door mode is the latest blood sport to sweep Los Santos, where teams strapped with an arsenal of weaponry compete on a rapidly shrinking floating platform high above the Pacific. Every kill banishes your enemies to respawn in the dreaded red zone – a purgatory area that only gives you scant seconds to escape back to the mainland before the rug is pulled out from under you and your fatal plummet begins."

- Rockstar Games Newswire description. This Adversary Mode takes place on raised platforms around the map. The mode behaves similarly to a standard deathmatch, but there are no points given for killing enemy players.

The large platforms are divided into multiple sections. At the start of a round, a section will turn red and become the "red zone", and will disappear after 30 seconds. Then, another section will turn red and the process repeats. A 30-second timer is present at the top center of the screen, notifying players when the platform will vanish.

Every time a player is killed, they will respawn in the red zone. If they do not make it off the platform in time, they will fall into the ocean, eliminating them - this is the only way a player can be eliminated. There are pickups scattered around the platforms, such as Carbine Rifles, Assault Shotguns, Sniper Rifles, and Body Armor, which can aid players in eliminating the enemy.

The only team that still has members on the platforms wins the round.

Locations
There are seven Trap Door missions in GTA Online, each taking place in a different location, which are as follows: