Like more than one of them
21 games close to two or more of Castle of Illusion, 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
Serious Sam HD: The First Encounter
Garry's Mod, but a boomer shooter, and a tenth of the hours
Loved · 93%FPS · ComedyAlso like Left 4 Dead 2
Ravenfield
Garry's Mod, but single-player, and a third of the hours
Loved · 97%Sandbox · FPSAlso 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
Black Mesa
Castle of Illusion, but a first-person shooter, and four times the hours
Loved · 95%RemakeAlso 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
Unturned
Left 4 Dead 2, but a survival crafting game
Loved · 91%Zombies · SurvivalAlso like Garry's Mod
Resident Evil 2
Left 4 Dead 2, but solo, and third-person
Loved · 97%Zombies · Survival HorrorAlso like Castle of Illusion
Resident Evil
Left 4 Dead 2, but single-player, and full of puzzles
Loved · 92%Zombies · Survival HorrorAlso like Castle of Illusion
Shotgun Farmers
Garry's Mod, but team-based, and a tenth of the hours
Loved · 93%FPS · ShooterAlso like Left 4 Dead 2
Call of Duty: World at War
Left 4 Dead 2, but set in World War II
Loved · 92%Zombies · FPSAlso like Garry's Mod
Serious Sam 2
Garry's Mod, but a boomer shooter, and gorier
Loved · 90%FPS · ComedyAlso like Left 4 Dead 2
Chained Together
Garry's Mod, but a precision platformer, and a tenth of the hours
Loved · 90%Physics · Online Co-OpAlso like Castle of Illusion
More like Castle of Illusion
2 games closest to Castle of Illusion of your picks
Crash Bandicoot N. Sane Trilogy
Castle of Illusion, but funny, and three times the hours
Loved · 92%Remake · Platformer
SpongeBob SquarePants: Battle for Bikini Bottom - Rehydrated
Castle of Illusion, but underwater, and twice the hours
Loved · 94%Remake · 3D Platformer
More like Garry's Mod
5 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 3D
Loved · 97%Sandbox · Physics
Hot Dogs, Horseshoes & Hand Grenades
Garry's Mod, but in VR, and half the hours
Loved · 97%Physics · Sandbox
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.