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Swarm is how multiplayer HL should have been, Xen Vs Human. Xen classes include: Gargantua (full size), Alien Grunt, Controller, Slave and Headcrab (who can transform to a Zombie). Human classes include: Grunt, Commander, Scientist, Female Assassin and Barney. Two Races, One Universe, Zero Tolerance! SOON: Easy install via Vapour.