Like more than one of them
20 games close to two or more of Quantum Conundrum, Garry's Mod and Left 4 Dead 2
Portal
Quantum Conundrum, but even better loved
Loved · 99%Puzzle Platformer · 3D PlatformerAlso like Garry's Mod
SCP: Secret Laboratory
Left 4 Dead 2, but free to play
Loved · 91%FPS · Survival HorrorAlso like Garry's Mod
Human Fall Flat
Quantum Conundrum, but co-op, and open world
Loved · 95%Puzzle Platformer · PhysicsAlso 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
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
Biped
Quantum Conundrum, but co-op, and half the hours
Liked · 85%Puzzle Platformer · 3D PlatformerAlso like Garry's Mod
Totally Accurate Battlegrounds
Garry's Mod, but free to play, and a battle royale
Liked · 88%Physics · SandboxAlso like Left 4 Dead 2
Suicide Guy
Quantum Conundrum, but darkly funny
Liked · 88%3D Platformer · Puzzle PlatformerAlso like Garry's Mod
Counter-Strike Nexon
Left 4 Dead 2, but free to play, and PvP
Mixed · 67%Zombies · FPSAlso like Garry's Mod
Kerbal Space Program
Garry's Mod, but a space sim, and single-player
Loved · 96%Physics · SandboxAlso like Quantum Conundrum
Super Bunny Man
Garry's Mod, but a platformer, and a party game
Liked · 85%Sandbox · PhysicsAlso like Quantum Conundrum
Splitgate
Garry's Mod, but free to play, and an arena shooter
Loved · 91%FPS · PhysicsAlso 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
How to Fish
Garry's Mod, but with fishing, and a tenth of the hours
Loved · 95%Physics · Online Co-OpAlso like Left 4 Dead 2
Serious Sam 2
Garry's Mod, but a boomer shooter, and a tenth of the hours
Loved · 90%FPS · ComedyAlso like Left 4 Dead 2
More like Quantum Conundrum
1 games closest to Quantum Conundrum of your picks
Portal 2
Quantum Conundrum, but story-rich, and darkly funny
Loved · 99%Puzzle Platformer · 3D Platformer
More like Garry's Mod
9 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
Fireworks Mania - An Explosive Simulator
Garry's Mod, but a hobby sim, and a tenth of the hours
Loved · 97%Sandbox · Physics
Hot Dogs, Horseshoes & Hand Grenades
Garry's Mod, but in VR, and half the hours
Loved · 97%Physics · Sandbox
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.