Play This FPS For Free on Steam This Weekend - GameSpot

Natural Selection 2 is free-to-play until Sunday, but you can buy it at a discount to keep playing.
Natural Selection 2 is a multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival.

Play This Game on Steam for Free Until Sunday - GameSpot

A Pair of Steam Games Are Free to Play This Weekend - GameSpot

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