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''Half-Life: Decay'' is an expansion pack for Valve Software's science fiction, first-person shooter video game ''Half-Life''. Developed by Gearbox Software and published by Sierra Entertainment, ''Decay'' was released as part of the PlayStation 2 version of ''Half-Life'' released on November 14, 2001. It is the third expansion pack for ''Half-Life'', and like its predecessors, ''Decay'' returns to the setting and timeline of the original story, albeit portraying the story from the viewpoint of a different set of protagonists: two scientists working in the Black Mesa Research Facility. ''Decay'' is a cooperative multiplayer game, designed to be played by two people working together to pass through the game's levels. ''Decay'' was not a critical success, but was received with some positivity by journalists in the video games industry. Many reviewers felt the game was fun to play through with a friend, but that its more puzzle-oriented gameplay somewhat detracted from the overall experience. A number of reviews stated that the game simply felt little more than an extra add-on for the PlayStation 2 version of ''Half-Life''. In September 2008, a group of Ukrainian developers unofficially ported the game to Windows as a modification of the PC version of ''Half-Life''. ==Gameplay== As is the case with the other games in the ''Half-Life'' series, ''Decay'' is a first-person shooter. Like the original title it is based on, ''Decay'' requires players to engage in combat with hostile non-player characters and complete various puzzle solving tasks to advance through the game. However, ''Decay'' differs from ''Half-Life'' and its first two expansion packs, ''Opposing Force'' and ''Blue Shift'', in that it is designed for cooperative multiplayer gameplay. This requires players to work together to progress through the game's levels and complete puzzles as they arise in-game. Although intended to be played by two people in split screen mode, ''Decay'' can still be played by a single player.〔 In this case, the player can only control one character at a time, and can switch between the two characters quickly. When not in use, a character has sufficient artificial intelligence to defend themselves, but otherwise does not move from where they have been left by the player.〔 In ''Half-Life'', players usually fight alone and only occasionally encounter friendly non-player characters who assist them, such as security guards and scientists. While ''Decay'' still features levels where this is the case, significant sections in ''Decay'' are dedicated to working with friendly non-player characters, usually escorting them to various objectives and protecting them in firefights.〔 An array of enemy characters from ''Half-Life'' populate the game, including alien lifeforms such as headcrabs and Vortigaunts, as well as human soldiers sent in to contain the alien threat. The players have access to a limited selection of ''Half-Life''s weaponry to assist them in the game.〔 Although developed after ''Opposing Force'', no non-player characters or weapons from the earlier expansion appear in ''Decay''. The game is unique in the context of the ''Half-Life'' series in that it is the only game divided into separate missions, each with a specific objective to pursue, instead of consisting of a single unbroken narrative. How players perform in each mission is ranked at the conclusion of the level as a grade from "A" to "F". This score is based on each player's accuracy with weapons, the number of kills they acquired and the amount damage they sustained during the course of the mission. Should players successfully complete the game's nine missions with "A" grades on every level, they are given access to a bonus cooperative mission, in which they can play as a pair of Vortigaunts, as well as the ability to play through the PlayStation 2 version of the original ''Half-Life'' as a Vortigaunt. 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: Decay」の詳細全文を読む スポンサード リンク
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