Version 3.2 der Natural Selection Modifikation für Half-Life (dt.) mit drei neuen Karten und einer Vielzahl an Verbesserungen (Change-Log) Natural Selection blends first-person combat with real-time strategy. It features intense "marines vs. aliens" teamplay, where one marine can become Commander. The Commander plays from a top-down perspective and leads live players. The aliens can evolve upgrades like "Cloaking" and "Scent of Fear", and can change lifeforms to run on walls, fly, and even devour marines whole. NS has atmospheric indoor sci-fi environments full of steam and smoke, and features custom orchestral music from the award-winning Jeremy Soule.