Aliens Versus Predator 2 is a science fiction first-person shooter video game developed by Monolith Productions and published by Sierra On-Line for Microsoft Windows in October 2001, and for Mac OS X in July 2003. The game is a sequel to Aliens Versus Predator (1999); both games are based on the characters of the Alien and Predator media franchises as well as the Alien vs. Predator crossover series. It is set on the fictional planet LV-1201, which houses a vast series of ruins infested with Aliens that is routinely visited by a clan of Predators who hunt the creatures for sport. The game is played from a first-person perspective. In the single-player mode, players control one of three characters, each with their own abilities and individual story modes. An online multiplayer mode, which allows players to play as one of four teams in competitive modes, is no longer officially supported and requires a community developed patch to enable multiplayer. An expansion pack titled Aliens Versus Predator 2: Primal Hunt was released in 2002. A Gold Edition of Aliens Versus Predator 2 followed, combining both the original game and the expansion pack into a single package. There was never any plans for a sequel, but in 2010 Rebellion Developments made a reboot simply titled Aliens vs. Predator. Gameplay Like its predecessor, Aliens Versus Predator 2 allows the player to choose one of three characters: an Alien, Predator, or human Colonial Marine. Each character has different objectives, abilities and weapons at their disposal. The single-player campaigns present the player with a conventional series of levels that are designed around the abilities of each species. As an Alien the player can explore most of the game's environments freely, even climbing across walls and ceilings. However, the Alien has no weapons and must use its claws, tail, and jaws to attack enemies. The player can also use a form of echolocation in dark areas and can detect pheromones to discern human or Predator enemies. The Alien can drop from any height without injury and is the fastest of the three player characters. When playing as the Predator, the player uses a variety of weapons from the Predator films such as wrist blades, a throwing disc, and shoulder-mounted energy weapons. The Predator is more durable than the human or the Alien and can survive falls from greater heights than the human. It can use a