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''Sid Meier's Civilization IV'' (also known as ''Civilization 4'' or ''Civ4'') is a turn-based strategy computer game and the fourth installment of the ''Civilization'' series. It was designed by Soren Johnson under the direction of Sid Meier and his video game development studio Firaxis Games, and then first released in North America, Europe, and Australia, between October 25 and November 4, 2005. ''Civilization IV'' uses the 4X empire-building model for turn-based strategy gameplay, in which the player's main objective is to construct a civilization from limited initial resources. Most standard full-length games start the player with the a settler unit and/or a city unit in the year 4000 BC. As with other games in the series, there are by default five objectives the player can pursue in order to finish the game: conquering all other civilizations, controlling a supermajority of the game world's land and population, building and sending the first sleeper ship to the Alpha Centauri star system, increasing the "Culture ratings" of at least three different cities to "legendary" levels, or winning a "World Leader" popularity contest by the United Nations. If the time limit for the game is reached and none of the previous goals has been fulfilled by any players including game AI players, the civilization with the highest total game score is declared winner. A large departure from earlier ''Civilization'' games is a new graphics engine created from scratch, based on the Gamebryo engine by Numerical Design Limited (NDL). The game has generally received nearly universal acclaim and was hailed as an example product of one of the leading video game producers in the turn-based strategy genre. ''Civilization IV'' has sold 3 million copies and won multiple awards, including several Game of the Year awards. In addition to this, Firaxis Games has also released two other major expansions, ''Civilization IV: Warlords'' and ''Civilization IV: Beyond the Sword'', as well as the standalone game ''Civilization IV: Colonization'', which were all combined in 2009 into one release edition titled ''Sid Meier's Civilization IV: The Complete Edition''. == Gameplay == ''Civilization IV'' follows some of the 4X model of turn-based strategy games, a genre in which players control an empire and "explore, expand, exploit, and exterminate", by having the player attempt to lead a modest group of peoples from a base with initially scarce resources into a successful empire or civilization.〔For sources that go into detail about each of the four Xs, see: ; ; 〕 The condition for winning the game is accomplished through one of the five ways: militarily defeating all other civilizations in the game world, controlling over two-thirds of the game world's land and population, building the first spaceship in the Space Age and sending it to Alpha Centauri, having the most dominant Culture ratings over other civilizations, or becoming "World Leader" through the United Nations votes. Additionally, there are multiple game scores for each civilization throughout the game based on the actions of each civilization and a number of different factors, allowing for a win condition based on the total of these points if the game timer runs out. The game can be played in multiple modes: as a single player facing against one or more computer-controlled opponents, or through online multiplayer games. As with other turn-based strategy video games, the player can customize the look and feel of their game world as well as the difficulty of any game AI players before the game starts. Each map space has a terrain type, such as plains, tundra, or desert, that affects the available resources players can extract from their environments and the movements of certain units through that terrain. The player is then given a total of 18 different civilizations to choose from, each with their own pros and cons, plus a leader avatar, an initial set of civilization technology, and any units unique to that civilization. When the game starts, however, it chooses random locations to place across a predefined square grid map. Like other strategy games, ''Civilization IV'' has a fog of war feature, in which unexplored territory remains darkened and territories without any units stationed on its designated square is shaded with darker colors. 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「Civilization IV」の詳細全文を読む スポンサード リンク
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