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| genre = First-person shooter | modes = Single-player | platforms = Windows, Xbox, Xbox 360, PlayStation 3, OS X, Linux, Shield Portable }} ''Half-Life 2'' (stylized as HλLF-LIFE2) is a first-person shooter video game and the sequel to ''Half-Life''. Developed by Valve Corporation, it was released on November 16, 2004, following a protracted five-year $40 million development, during which a substantial part of the project was leaked and distributed on the Internet. The game follows some years after the events of ''Half-Life'', where the protagonist, Gordon Freeman, is woken by the enigmatic G-Man to find the world has been taken over by the alien Combine due to events that occurred at the Black Mesa Research Facility, the setting of the first game. Gordon encounters human resistance forces that aid him, including former associates from Black Mesa, among them Dr. Eli Vance and his daughter Alyx. Alyx joins Gordon as they search for a way to eliminate the Combine from Earth and free humanity. The game is a first-person shooter played from Gordon's perspective, with the player using a variety of weapons including the gravity gun to eliminate hostile forces and solve physics-based puzzles to progress forward in the game. The game was developed alongside Valve's Steam software. It introduced the Source game engine and, because of Steam, was the first single-player video game to require online product activation. Like its predecessor, ''Half-Life 2'' received critical acclaim.〔(【引用サイトリンク】 ''Half-Life 2'' PC Reviews )〕〔(【引用サイトリンク】 ''Half-Life 2'' PC Reviews )〕 It was praised for its advanced physics, animation, sound, AI, graphics, and narrative. The game won 39 "Game of the Year" awards〔"valve">(【引用サイトリンク】 Valve Awards )〕 and the title of "Game Of The Decade" at the 2012 Spike Video Game Awards.〔(【引用サイトリンク】url=http://www.reviewsontherun.com/index/index/vid_id/20429/rp/10 )(【引用サイトリンク】 title= Video Game Awards )〕〔(【引用サイトリンク】url=http://uk.ign.com/decade/best-games-decade.html )〕 Over 6.5 million copies of ''Half-Life 2'' were sold at retail by December 3, 2008, (not including the number of sales via Steam). As of February 9, 2011, ''Half-Life 2'' had sold over 12 million copies. ''Half-Life 2'' is often considered to be one of the greatest video games of all time. ==Gameplay== Like its predecessor, ''Half-Life 2'' is a single-player first-person shooter broken into several chapters, permanently casting the player as the protagonist Gordon Freeman. The sequel has nearly the same mechanics as ''Half-Life'', including health-and-weapon systems and periodic physics puzzles, except with the newer Source Engine and improved graphics. The player also starts without items, slowly building up an arsenal over the course of the game. Despite the game's mainly linear nature, much effort was put into making exploration rewarding and interesting; many optional areas can be missed or avoided. A diverse set of enemies is present, which usually require being approached with different tactics: some coordinate in groups to out-maneuver or out-position the player; others, like the Manhack, fly directly at the player through small openings and tight corridors; still others use predictable but powerful attacks, while others hide before swiftly attacking the player. Gordon can kill most enemies with his weapons, or make use of indirect means, exploiting environmental hazards such as explosive pressurized canisters, gas fires or improvised traps. For some portions of the game, Gordon can be joined by up to four armed Resistance soldiers and medics, and can send his team further from him or call them back. Many of the game's new features utilize its detailed physics simulation. Two sections of the game involve driving vehicles. Instead of button-based puzzles from ''Half-Life'', environmental puzzles are also introduced with makeshift mechanical systems, revolving around the player's new ability to pick up, move, and place objects. Solutions involve objects' physical properties, such as shape, weight, and buoyancy. For example, in Chapter 3, Route Kanal, the player is required to stack cinder blocks on a makeshift see-saw ramp to proceed over a wall. Alternatively, the player can use these to build a crude staircase, so sometimes, multiple approaches lead to the desired outcome. Part-way through the game, Gordon acquires the Gravity Gun, which allows him to draw distant objects towards himself or forcefully push them away, as well as the ability to manipulate larger and heavier objects that he cannot manipulate without the weapon. These abilities are required to solve puzzles later in the game, and can also be used to great effect in combat, as any non-static object within proximity to the player has the potential to be used as a makeshift defense (e.g. a file cabinet) or a deadly projectile (e.g. a gasoline can or a buzzsaw blade). The game never separates the player with pre-rendered cutscenes or events; the story proceeds via exposition from other characters and in-world events, and ensures that the player controls Gordon for the entirety of the game. Much of the backstory to the game is simply alluded to, or told through the environment. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Half-Life 2」の詳細全文を読む スポンサード リンク
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