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| genre = First-person shooter, survival horror | modes = Single-player, multiplayer | platforms = Microsoft Windows Xbox 360 OS X Linux }} ''Left 4 Dead 2'' is a cooperative first-person shooter video game, the sequel to Turtle Rock Studios's ''Left 4 Dead''. The game launched on November 17, 2009, for Microsoft Windows and Xbox 360 in the United States and November 20 in Europe. On September 5, 2010 the game was made available to the Steam client for Mac OS X, and on July 2, 2013 it was made available through Steam for Linux.〔 Valve released the game as a free download for all Steam users for a 24-hour period on December 25, 2013.〔store.steampowered.com/news/12151/〕 ''Left 4 Dead 2'' builds upon cooperatively focused gameplay and Valve's proprietary Source engine, the same game engine used in the original ''Left 4 Dead''. Set during the aftermath of an apocalyptic pandemic, ''Left 4 Dead 2'' focuses on four new Survivors, fighting against hordes of the Infected, who develop severe psychosis and exhibit zombie-like tendencies. The Survivors must fight their way through five campaigns, interspersed with safe houses that act as checkpoints, with the goal of escape at each campaign's finale. The gameplay is procedurally altered by the "AI Director 2.0", which monitors the players' performance and adjusts the scenario to provide a dynamic challenge. Other new features include new types of Special Infected and an arsenal of melee weapons. The game made its world premiere at E3 2009 with a trailer during the Microsoft press event. Prior to release, it received a combination of positive and negative critical and community reactions. It attracted an unusually high volume of pre-release controversy about the game's graphic content. In response, alterations were made to the cover art and both Australia (due to having no R18+ rating for video games at the time) and Germany refused to rate the unmodified edition at the time of release. After release however, the game was met with positive reviews. ==Gameplay== Like its predecessor, ''Left 4 Dead 2'' is a first-person shooter with a heavy emphasis on cooperative gameplay. The game presents five new campaigns, each composed of three to five smaller levels. As in the first game, each campaign is presented in menus and loading screens as a film starring the four Survivors; and features, upon completing a campaign, a faux credits screen which acts as the final scoreboard for the players and recaps certain performance statistics for the group. In every campaign, most levels involve the Survivors attempt to reach a safe zone and close the door once they are all safely inside. However, the final level in each campaign requires the Survivors to call for rescue and either survive a prolonged onslaught until rescue arrives, pass through an especially challenging gauntlet of Infected to reach an escape vehicle, or (in ''Dead Center'' and ''The Passing'') collect and utilize fuel cans to enable their escape.〔〔 Each Survivor can carry one of each five categories of equipment. The main weapons are broken down into four tiers based on their availability and attributes. Tier one weapons (such as the ''SMG'' and ''Chrome Shotgun'') have a low ratio of damage for time, and serve as basic offensive weapons. Tier two weapons (such as the ''Assault Rifle'' and ''Combat Shotgun'') carry a higher amount of damage per time unit and often appear in later maps of each chapter. The two tier three weapons (''Grenade Launcher'' and ''M60'') differ from one and two in the fact that they cannot refill their ammunition from ammunition dumps and generally there is only one or two at most of each per map. They carry a high damage ratio at the cost of limited ammo. Tier four weapons are all mounted weapon systems and carry unlimited ammunition. The mounted weapons carry the highest damage ratio, but at the cost of overheating after a period of non-stop use. The mounted weapons are in set positions in maps and have a fixed arc of fire. They cannot be given ammunition pack upgrades to the bullets or utilize the laser sights attachment. Either a melee weapon or pistols are used as secondary weapons. Although melee weapons cause extra damage to Infected when struck, the Survivors can use any other weapon or item for weaker melee attacks that can push the Infected back. Players also carry a flashlight with infinite battery life, the use of which enables players to see in the dark (with the downside of the player gaining the attention of the Infected much faster). They may also carry a single first aid kit, special ammo pack, or a defibrillator; in addition to either pain pills or an adrenaline shot. They may also carry a single throwable weapon—Molotov cocktails to set an area on fire; pipe bombs to attract any nearby Infected to the flashing light and sound it makes until it explodes; and Boomer bile, which attracts Common Infected to whatever it hits (e.g. fires, Special Infected, each other). To enable situational awareness of other Survivors, players are shown the health and status of their fellow survivors. If a player does not have direct sight of another Survivor (e.g. a wall is blocking their view of the others), they will be shown the Survivor's highlighted silhouette. The Survivors are also susceptible to friendly fire, forcing players to exercise caution when shooting or swinging their weapons. As Survivors take damage, they move more slowly; if a Survivor's health drops to zero, they are incapacitated and left to fight off the Infected using a handgun until rescued by another Survivor. If a Survivor dies, they remain dead until the next level, unless revived by a defibrillator, or, in Campaign or Singleplayer mode, reappear in a "Rescue Closet" to be freed by other Survivors. Should all Survivors die or be incapacitated, the game will end, at which point the players may restart that chapter or quit the game. 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「Left 4 Dead 2」の詳細全文を読む スポンサード リンク
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