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Halloween is an extra-special time of year for sci-fi FPS-RTS Natural Selection, as the birthday of both the original Half-Life mod and its standalone commercial sequel [official site]. In celebration, developers Unknown Worlds have opened up NS2 for the weekend and let everyone play for free. Battling aliens, knee deep in bacterial gunk, or chomping on the juicy heads of space marines seems fittingly frightful Halloween fun. … [visit site to read more]