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In this quiz, we guess: Alyx Vance, Antlion, Antlion Guard, Barnacle, Barney Calhoun, Bullsquid, City Policeman, Combine Advisor, Dog, Eli Vance, Fast Headcrab, Fast Zombie, Father Grigori, G-Man, Gargantua, Gordon Freeman, Hunter, Isaac Kleiner, Judith Mossman, Manhack, Nihilanth, Overwatch Soldier, Poison Headcrab, Poison Zombie, Regular Headcrab, Regular Zombie, Stalker, Strider, Vortigaunt, Wallace Breen.