Games like Onsen 1313
Games like Onsen 1313 include DOOM, METRO 2033 Redux, Black Mesa, METRO Last Light Redux, and Ready or Not. We matched them by the tags players give Onsen 1313 on Steam (Horror, Retro, First-Person, FPS, and Singleplayer): closest matches first, and among equally close ones the better-known games.
DOOM
Shared: FPS · Action · First-Person
METRO 2033 Redux
Shared: FPS · Horror · First-Person
Black Mesa
Shared: FPS · First-Person · Action
METRO Last Light Redux
Shared: FPS · Horror · Action
Ready or Not
Shared: FPS · Horror · Singleplayer
Metro Exodus
Shared: FPS · Singleplayer · Horror
Half-Life: Alyx
Shared: Horror · FPS · First-Person
Half-Life 2
Shared: FPS · Action · Singleplayer
Battlefield™ 1
Shared: FPS · Singleplayer · First-Person
BioShock™ Remastered
Shared: Horror · FPS · First-Person
BioShock Infinite
Shared: First-Person · Action · FPS
Call of Duty®
Shared: FPS · Singleplayer · First-Person
BioShock™
Shared: FPS · Horror · Singleplayer
Resident Evil Village
Shared: Horror · First-Person · Singleplayer
DOOM Eternal
Shared: FPS · Action · First-Person
Devil Daggers
Shared: FPS · Horror · Retro
Trepang2
Shared: Horror · FPS · Singleplayer
DUSK
Shared: Retro · FPS · Horror
Left 4 Dead 2
Shared: FPS · Horror · Action
BioShock™ 2 Remastered
Shared: FPS · Horror · Singleplayer
DOOM 3
Shared: Horror · FPS · Action
BioShock® 2
Shared: FPS · Horror · Singleplayer
HROT
Shared: Retro · FPS · First-Person
F.E.A.R.
Shared: Horror · FPS · Action