Like more than one of them
20 games close to two or more of Basement, Garry's Mod and Left 4 Dead 2
Scrap Mechanic
Garry's Mod, but a survival crafting game, and with base building
Loved · 92%Building · PhysicsAlso like Basement
Space Engineers
Garry's Mod, but a survival crafting game, and in space
Liked · 89%Building · SandboxAlso like Basement
POSTAL 2
Basement, but a first-person shooter, and open world
Loved · 97%Dark Comedy · Dark HumorAlso like Garry's Mod
Mindustry
Basement, but a tower defense game, and five times the hours
Loved · 96%Base Building · Resource ManagementAlso like Garry's Mod
Prison Architect
Basement, but top-down, and six times the hours
Liked · 85%Base Building · ManagementAlso 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
7 Days to Die
Garry's Mod, but a base builder, and about survival
Liked · 87%Building · SandboxAlso like Left 4 Dead 2
Bum Simulator
Garry's Mod, but a life sim, and open world
Liked · 88%Sandbox · PhysicsAlso like Basement
SCP: Secret Laboratory
Left 4 Dead 2, but free to play
Loved · 91%FPS · Survival HorrorAlso like Garry's Mod
Satisfactory
Basement, but co-op, and 12 times the hours
Loved · 97%Base Building · Resource ManagementAlso like Garry's Mod
Sons Of The Forest
Garry's Mod, but a survival horror game, and with crafting
Liked · 88%Building · SandboxAlso like Basement and Left 4 Dead 2
Planet Coaster
Basement, but relaxing, and funny
Loved · 91%Management · BuildingAlso like Garry's Mod
Blockland
Garry's Mod, but a quarter of the hours, and more divisive
Mixed · 74%Building · SandboxAlso like Left 4 Dead 2
Subsistence
Garry's Mod, but a base builder, and about survival
Mixed · 72%Building · SandboxAlso like Basement and 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
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
More like Basement
5 games closest to Basement of your picks
Oxygen Not Included
Basement, but a survival game, and ten times the hours
Loved · 97%Base Building · Resource Management
Factorio
Basement, but with crafting, and 21 times the hours
Loved · 98%Base Building · Resource Management
Evil Genius 2
Basement, but you're the villain, and four times the hours
Mixed · 69%Base Building · Management
More like Garry's Mod
4 games closest to Garry's Mod of your picks
Fireworks Mania - An Explosive Simulator
Garry's Mod, but a hobby sim, and a tenth of the hours
Loved · 97%Sandbox · Physics
Saints Row: The Third
Garry's Mod, but a third-person shooter, and half the hours
Loved · 96%Sandbox · Comedy
More like Left 4 Dead 2
1 games closest to Left 4 Dead 2 of your picks
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.