PlayerUnknown's Battlegrounds (PUBG) is a massively multiplayer online survival game developed and published by Bluehole for Microsoft Windows. The game is based on battle royal-style game mods previously made by Brendan "PlayerUnknown" Greene for other games, but expanded out into a standalone game under Greene's creative direction. In the game, up to one hundred players parachute onto an island and scavenge for weapons and equipment to kill others while avoiding getting killed themselves. The available safe area of the game's world decreases in size over a match, directing surviving players into tighter areas and forcing encounters. The last player or team standing wins the round.