Games like PATHOGEN X
Games like PATHOGEN X include Resident Evil Village, Left 4 Dead 2, Resident Evil Requiem, Resident Evil 7 Biohazard, and METRO 2033 Redux. We matched them by the tags players give PATHOGEN X on Steam (Survival Horror, FPS, Horror, Zombies, and Shooter): closest matches first, and among equally close ones the better-known games.

Resident Evil Village
Shared: Survival Horror · Horror · Singleplayer

Left 4 Dead 2
Shared: FPS · Zombies · Shooter

Resident Evil Requiem
Shared: Survival Horror · Horror · Zombies

Resident Evil 7 Biohazard
Shared: Survival Horror · Horror · Singleplayer

METRO 2033 Redux
Shared: FPS · Horror · Singleplayer

Dying Light
Shared: Survival Horror · Zombies · Horror

Resident Evil 2
Shared: Survival Horror · Zombies · Horror

Outlast
Shared: Survival Horror · Horror · First-Person

Half-Life 2
Shared: FPS · Action · Singleplayer

Black Mesa
Shared: FPS · Action · Singleplayer

Call of Duty®: Black Ops III
Shared: FPS · Zombies · Shooter

Metro Exodus
Shared: FPS · Singleplayer · Horror

Resident Evil 4
Shared: Survival Horror · Horror · Zombies

METRO Last Light Redux
Shared: FPS · Horror · Action

Back 4 Blood
Shared: Zombies · FPS · Shooter

Half-Life: Alyx
Shared: FPS · Horror · Shooter

DOOM
Shared: FPS · Shooter · Action

BioShock Infinite
Shared: FPS · Shooter · Action

Resident Evil 4 (2005)
Shared: Survival Horror · Zombies · Horror

Ready or Not
Shared: FPS · Shooter · Horror

Choo-Choo Charles
Shared: Survival Horror · Horror · Singleplayer

Outlast 2
Shared: Survival Horror · Horror · First-Person

DOOM 3
Shared: Horror · FPS · Action

Poppy Playtime
Shared: Horror · Survival Horror · Singleplayer