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|genre = First-person shooter |modes = Single-player |platforms = Windows, Xbox 360, PlayStation 3, OS X, Linux }} ''Half-Life 2: Episode One'' is a first-person shooter video game, the first in a series of episodes that serve as the sequel for the 2004 ''Half-Life 2''. It was developed by Valve Corporation and released on June 1, 2006. Originally called ''Half-Life 2: Aftermath'', the game was later renamed to ''Episode One'' after Valve became confident in using an episodic structure for the game. Similar to ''Half-Life 2'', ''Episode One'' also uses the Source game engine. The game debuted new lighting and animation technologies, as well as AI sidekick enhancements. The game's events take place immediately after those in ''Half-Life 2'', in and around war-torn City 17. ''Episode One'' follows scientist Gordon Freeman and his companion Alyx Vance as they fight in humanity's continuing struggle against the transhuman race known as the Combine. When the story begins, Gordon wakes up outside the enemy's base of operations, the Citadel, after being left unconscious from the concluding events of ''Half-Life 2''. During the course of the game, Gordon travels with Alyx as they attempt to evacuate the city. As the game comes to an end, Gordon and Alyx are caught in a major accident, and their fates are revealed in the sequel, ''Episode Two''. Valve views episodes ''One'' through ''Three'' as tantamount to a standalone release. ''Episode One'' is available as part of a bundle package known as ''The Orange Box'', which also includes ''Half-Life 2'', ''Episode Two'', ''Team Fortress 2'', and ''Portal''. ''Episode One'' received a generally positive critical reaction, and the co-operative aspects of the gameplay received particular praise but its short length was criticized. == Gameplay == In ''Episode One'' players make their way through a linear series of levels and encounter various enemies and allies. The gameplay is broken up between combat-oriented challenges and physics-based puzzles.〔 ''Episode One'' integrates tutorial-like tasks into the story to familiarize the player with new gameplay mechanics without breaking immersion. A heads-up display appears on the screen to display the character's health, energy, and ammunition.〔(【引用サイトリンク】url=http://guides.ign.com/guides/492830/page_2.html )〕 Throughout the course of the game, the player accesses new weapons and ammunition that are used to defend the character from enemy forces.〔(【引用サイトリンク】url=http://guides.ign.com/guides/740555/page_2.html )〕 Unlike in ''Half-Life 2'', where Gordon's initial weapon is the crowbar, Gordon first acquires the Gravity Gun, which plays a crucial role in the game by allowing the player to use physics to manipulate objects at a distance in both combat and puzzle-solving scenarios.〔 The AI for Alyx Vance, Gordon's companion, was designed specifically for co-operative play in ''Episode One'' to complement the player's abilities. The developers described Alyx's programming for ''Episode One'' as a "personality code" as opposed to an "AI code", emphasizing the attention they gave to make Alyx a unique and believable companion. For part of the code, she was specifically programmed to avoid performing too many mechanical or repetitive actions, such as repeating lines of dialogue or performing certain routines in combat situations. Examples of this co-operative gameplay include combat in underground levels. In this scenario, the player can conserve their ammunition by using a flashlight to help Alyx spot and kill oncoming enemies. Similarly, Alyx will often take up strategic positions and provide covering fire to keep the player safe while they travel to a certain area or perform certain actions.〔 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: Episode One」の詳細全文を読む スポンサード リンク
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