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4X is a genre of strategy-based games in which players control an empire and "eXplore, eXpand, eXploit, and eXterminate". Emphasis is placed upon economic and technological development, as well as a range of non-military routes to supremacy. Games can take a long time to complete since the amount of micromanagement needed to sustain an empire increases as the empire grows.

Games that can be played by more than one player, either locally or online.

Stands for "player versus player" and refers to a wide variety of games where players can compete for dominance with one another.