Like more than one of them
24 games close to two or more of Atom Zombie Smasher, Garry's Mod and 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
Counter-Strike Nexon
Left 4 Dead 2, but free to play, and PvP
Mixed · 67%Zombies · FPSAlso like Garry's Mod and Atom Zombie Smasher
Yet Another Zombie Defense
Atom Zombie Smasher, but a top-down shooter, and a third of the hours
Liked · 87%Tower Defense · ZombiesAlso like Left 4 Dead 2
7 Days to Die
Atom Zombie Smasher, but a survival crafting game, and a base builder
Liked · 87%Zombies · Tower DefenseAlso like Garry's Mod and Left 4 Dead 2
Unturned
Left 4 Dead 2, but free to play, and a survival crafting game
Loved · 91%Zombies · SurvivalAlso like Garry's Mod and Atom Zombie Smasher
Ravenfield
Garry's Mod, but single-player, and a third of the hours
Loved · 97%Sandbox · FPSAlso like Left 4 Dead 2
Plants vs. Zombies: Game of the Year
Atom Zombie Smasher, but built by hand, and twice the hours
Loved · 98%Tower Defense · ZombiesAlso like Left 4 Dead 2
State of Decay 2
Left 4 Dead 2, but a base builder, and open world
Liked · 83%Zombies · SurvivalAlso like Atom Zombie Smasher
Call of Duty: World at War
Left 4 Dead 2, but set in World War II
Loved · 92%Zombies · FPSAlso like Garry's Mod
SCP: Secret Laboratory
Left 4 Dead 2, but free to play
Loved · 91%FPS · Survival HorrorAlso like Garry's Mod
Zombie Panic! Source
Left 4 Dead 2, but half the hours, and more divisive
Liked · 85%Zombies · FPSAlso like Garry's Mod
Blockland
Garry's Mod, but open world, and a quarter of the hours
Mixed · 74%Building · SandboxAlso like Left 4 Dead 2 and Atom Zombie Smasher
Project Zomboid
Left 4 Dead 2, but a survival crafting game, and twice the hours
Loved · 94%Zombies · SurvivalAlso like Atom Zombie Smasher
Bodycam
Garry's Mod, but a tenth of the hours, and more divisive
Liked · 81%FPS · PhysicsAlso like Left 4 Dead 2
Contagion
Left 4 Dead 2, but PvP, and a third of the hours
Mixed · 73%Zombies · FPSAlso like Atom Zombie Smasher
Bloons TD5
Atom Zombie Smasher, but co-op, and three times the hours
Loved · 95%Tower Defense · StrategyAlso like Garry's Mod
Door Kickers: Action Squad
Atom Zombie Smasher, but a shoot 'em up, and a 2D platformer
Loved · 95%Zombies · Local Co-OpAlso like Left 4 Dead 2
More like Atom Zombie Smasher
2 games closest to Atom Zombie Smasher of your picks
Bloons TD Battles 2
Atom Zombie Smasher, but free to play, and competitive
Liked · 84%Tower Defense · Real Time Tactics
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
Dead Island Definitive Edition
Left 4 Dead 2, but an action RPG, and open world
Liked · 82%Zombies · Survival
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.