premise: Civilization IV received high ratings.
hypothesis: Civilization IV . 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 . The game has received critical acclaim and was hailed as an exemplary product of one of the leading video game producers in the turn-based strategy genre .