Like more than one of them
24 games close to two or more of Observer: System Redux, Garry's Mod and Left 4 Dead 2
SCP: Secret Laboratory
Left 4 Dead 2, but free to play
Loved · 91%FPS · Survival HorrorAlso like Garry's Mod
No More Room in Hell
Left 4 Dead 2, but free to play, and half the hours
Loved · 90%Zombies · SurvivalAlso like Garry's Mod
R.E.P.O.
Garry's Mod, but a survival horror game, and a quarter of the hours
Loved · 96%Physics · ComedyAlso like Left 4 Dead 2
Content Warning
Garry's Mod, but a horror game, and a tenth of the hours
Loved · 94%Physics · Online Co-OpAlso like Left 4 Dead 2
Far Cry
Garry's Mod, but open world, and a fifth of the hours
Liked · 82%FPS · SandboxAlso like Observer: System Redux and Left 4 Dead 2
Species: Unknown
Observer: System Redux, but co-op, and with aliens
Loved · 94%Investigation · StealthAlso like Left 4 Dead 2
Counter-Strike Nexon
Left 4 Dead 2, but free to play, and PvP
Mixed · 67%Zombies · FPSAlso like Garry's Mod
Shift At Midnight
Observer: System Redux, but a job sim, and half the hours
Liked · 88%Investigation · HorrorAlso like Left 4 Dead 2
Escape the Backrooms
Observer: System Redux, but co-op
Loved · 90%Horror · StealthAlso like Left 4 Dead 2
BIGFOOT
Left 4 Dead 2, but PvP, and a third of the hours
Liked · 82%Survival Horror · FPSAlso like Garry's Mod
Hello Neighbor
Observer: System Redux, but a puzzle game, and harder
Liked · 86%Stealth · HorrorAlso like Left 4 Dead 2
Zombie Panic! Source
Left 4 Dead 2, but half the hours, and more divisive
Liked · 85%Zombies · FPSAlso like Garry's Mod
Deceit
Left 4 Dead 2, but a social deduction game, and your choices matter
Mixed · 79%Zombies · FPSAlso like Garry's Mod
Project Silverfish
Observer: System Redux, but an immersive sim, and a first-person shooter
Loved · 93%Horror · StealthAlso like Garry's Mod and Left 4 Dead 2
Far Cry 3
Garry's Mod, but stealthy, and a third of the hours
Liked · 88%FPS · SandboxAlso like Left 4 Dead 2
White Noise 2
Observer: System Redux, but team-based, and about survival
Liked · 80%Horror · InvestigationAlso like Left 4 Dead 2
Half-Life 2
Garry's Mod, but story-rich, and a quarter of the hours
Loved · 98%FPS · PhysicsAlso like Left 4 Dead 2
Wolfenstein: The Old Blood
Observer: System Redux, but set in World War II, and gorier
Loved · 90%Alternate History · StealthAlso like Left 4 Dead 2
Evolve Stage 2
Left 4 Dead 2, but sci-fi, and more divisive
Mixed · 70%FPS · Team-BasedAlso like Garry's Mod
Ravenfield
Garry's Mod, but single-player, and a third of the hours
Loved · 97%Sandbox · FPSAlso like Left 4 Dead 2
More like Observer: System Redux
2 games closest to Observer: System Redux of your picks
USAC: Code Breach
Observer: System Redux, but a first-person shooter, and a puzzle game
Loved · 91%Cyberpunk · Investigation
More like Garry's Mod
2 games closest to Garry's Mod of your picks
Scrap Mechanic
Garry's Mod, but a survival crafting game, and with base building
Loved · 92%Building · Physics
More like Left 4 Dead 2
2 games closest to Left 4 Dead 2 of your picks
Cry of Fear
Left 4 Dead 2, but a psychological horror game, and a third of the hours
Liked · 89%Zombies · Survival Horror
How this list is made
Each game is measured against each of your picks the way a games-like list measures it: the Steam community tags, Steam genres and IGDB themes they share, each counting for more the fewer games carry it. A game's place is how alike it is to your picks together, as a share of each pick's best match, so one alike to two of them comes before one alike to just one. It must be close to at least one of them, as close as it would have to be on that game's own list.
None of your picks is on the list, nor a second release of one, nor a game of their own series. Up to 30 games are shown. Under each name, the kinds it shares with the pick it is closest to, and how it differs from that pick.