Games like Half-Life: Opposing Force

Loved Half-Life: Opposing Force? These 20 games share the most with it (FPS, Action, Sci-fi). Start with Quake, Crysis Warhead and Aliens vs. Predator.

QuakeLike Half-Life: Opposing Force: 1990's, FPS and ShooterCrysis WarheadLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiAliens vs. PredatorLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiCrysis 3 RemasteredLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiDuke Nukem ForeverLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiAliens versus Predator Classic 2000Like Half-Life: Opposing Force: Aliens, FPS and Sci-fiBlack MesaLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiAliens: Colonial Marines CollectionLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiCrysis 2 - Maximum EditionLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiQuake IILike Half-Life: Opposing Force: 1990's, FPS and Sci-fiJACK STYLERLike Half-Life: Opposing Force: Aliens, FPS and MilitaryDOOM IILike Half-Life: Opposing Force: 1990's, FPS and Sci-fiAlien Rage - UnlimitedLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiUnreal GoldLike Half-Life: Opposing Force: 1990's, FPS and Sci-fiUnreal 2: The AwakeningLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiInsurgency: SandstormLike Half-Life: Opposing Force: FPS, Military and ShooterMaster Levels for Doom IILike Half-Life: Opposing Force: 1990's, FPS and Sci-fiCrysis RemasteredLike Half-Life: Opposing Force: Aliens, FPS and Sci-fiSquadLike Half-Life: Opposing Force: FPS, Military and ShooterArma ReforgerLike Half-Life: Opposing Force: FPS, Military and Shooter