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Civilization would perhaps be the best example, but space-based variations are definitely not to be underestimated.
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We begin with recon, so we can build a strong strategic position using the available resources and eventually proceed to eliminate any opposition on the map, usually by force. The mysterious 4X, introduced way before the ever-present 4K, means: explore, expand, exploit and exterminate, which pretty clearly describes the essence of gameplay.
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The 4X games may not be the most known member of the gaming family, but they are quite popular and have their own group of devoted fans.
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