<nowiki>Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; 半条命：针锋相对; Half-Life: Opposing Force; Half-Life: Opposing Force; Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; 半條命：針鋒相對; 하프라이프: 어포징 포스; Half Life: Opposing force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; هاف-لايف: اوبوزينج فورس; نیمهعمر: نیروی مهاجم; 戰慄時空：正面交鋒; Half-Life: Opposing Force; ฮาล์ฟ-ไลฟ์: ออปโพสซิงฟอร์ซ; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; Half-Life: Opposing Force; 戰慄時空：正面交鋒; Half-Life: Opposing Force; Half-Life: Opposing Force; هاف-لايف: أوبوزينغ فورس; 半条命：针锋相对; Half-Life: Opposing Force; videojuego de 1999; videójáték; gem video; компьютерная игра 1999 года в жанре шутера от первого лица; Computerspiel-Erweiterung aus dem Jahr 1999; 1999 video game; parmaènan video; joc video din 1999; expansionspaket från år 1999 till datorspelet Half-Life; відеогра 1999 року; egwuregwu vidīò 1999; 1999 videopeli; 1999 video game; Datadisk k Half Life; Computaspui vo 1999; videogioco del 1999; jeu vidéo de 1999; gim vidéo; parmeaman video; vídeojogo de 1999; videospēle; pamainan video; видео-игра; jogo eletrônico de 1999; ڤيديو جيم; gim delengan; gra wideo; utvidelslspakke for science fiction-videospillet Half-Life; computerspel van Gearbox Software; videoigra; vidheo gim; kaulinan video; videojoc de 1999; 1999 expansion pack for the science fiction first-person shooter video game Half-Life; لعبة فيديو من فالف; βιντεοπαιχνίδι του 1999; geumeugah video; Half Life: Opposing Force; Half Life Opposing Force; Half-Life Opposing Force; Opposing Force; Oppossing Force; Opposing Force; Op4; Hazardous Enviorment Combat Unit; Opposing Force; OpFor; Opposing Force; Opposing Force; Opposing Force; Opposing Force; Half Life: Opposing Force; 어포징 포스; HL: Opposing Force; Half Life: Opposing Force; HL:OF; نیمه جان: نیروی مهاجم; نیمهٔ جان: نیروی مهاجم; 戰慄時空：對立力量; 戰慄時空：正面交鋒; 半条命:对立力量; 半条命：对立力量; Opposing Force; OF; OpForce; Op4</nowiki>
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This category has only the following subcategory.
