Grand Theft Auto Online has launched a Halloween event that is set to run for two weeks.

The event introduces new in-game items and a new game mode called Slasher.

Masks can be purchased in demon, werewolf, alien, sewer creature, pumpkin, Frankenstein, Freddy Krueger, or burlap sack varieties, each with multiple colour variants.

New vehicles include the Albany Lurcher hearse and the Franken Strange hotrod.

The "Slasher" Adversary mode casts one player as a shotgun-wielding killer and the other players as flashlight-equipped survivors in an asymmetric multiplayer game.

Players can also buy the Slasher flashlight for general use, as well as Halloween bobbleheads and T-shirts.

All content was hidden inside the game's recent, free Lowriders update.

The Halloween Surprise runs until November 16th.