Natural Selection is a multiplayer-only Half-Life mod where one team plays marines and the other plays aliens. The humans must keep their cool and work together to assault an alien-infested spacecraft or colony. Marines vs. marines and aliens vs. aliens scenarios will also be supported in the near future. This mod features "first-person strategy" with a real resource model and consequences for actions. Both sides are genuinely different and together they accommodate different play styles. With Marines, fighting skill is less important, strategy and communication take its place. Playing as a marine will be a tense experience with methodical planning and strategy, interrupted with action. On the other hand, playing as an alien will be an intense action experience, rewarding reflexes and alien heroics. Communication and coordination don't require typing.
||Windows 98/Me/2000/XP, Half-Life retail version