Tension runs high in the excellent XCOM: Enemy Unknown. Click on Read More to check out The Good, The Bad and the critic scores.

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Tension-filled turn-based matches
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Great sense of progression makes you feel increasingly powerful
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Complex interconnected economy makes each decision important
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Soldier perma-death gets you invested in the fate of your veterans.

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Map repetition
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Camera foibles and other visual glitches.

Enemy Unknown packs dense amounts of dramatic tension into each turn. And so it's time to eliminate the alien threat, commander. Select a location, build your base…and save humanity.
The absolute best aspect of XCOM is the sense that there's never enough time or resources to do everything that needs to be done.