Like more than one of them
20 games close to two or more of Necropolis, Garry's Mod and Left 4 Dead 2
Gunfire Reborn
Necropolis, but a first-person shooter, and three times the hours
Loved · 93%Roguelike · Action RoguelikeAlso 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 Necropolis 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
Content Warning
Garry's Mod, but a horror game, and a tenth of the hours
Loved · 94%Physics · Online Co-OpAlso like Necropolis and Left 4 Dead 2
Roboquest
Necropolis, but a first-person shooter, and co-op
Loved · 95%Action Roguelike · RogueliteAlso 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
Zombie Panic! Source
Left 4 Dead 2, but half the hours, and more divisive
Liked · 85%Zombies · FPSAlso 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
Remnant: From the Ashes
Necropolis, but a third-person shooter, and not a roguelike
Liked · 84%Souls-like · Co-opAlso like Left 4 Dead 2
Unturned
Left 4 Dead 2, but a survival crafting game
Loved · 91%Zombies · SurvivalAlso like Garry's Mod
Deadzone: Rogue
Necropolis, but first-person, and horror
Liked · 82%Roguelike · Action RoguelikeAlso 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
Death Road to Canada
Necropolis, but a survival game, and with zombies
Loved · 93%Action Roguelike · RoguelikeAlso like Left 4 Dead 2
More like Necropolis
5 games closest to Necropolis of your picks
Risk of Rain (2013)
Necropolis, but a 2D platformer, and twice the hours
Loved · 93%Action Roguelike · Roguelike
Heroes of Hammerwatch
Necropolis, but pixel art, and three times the hours
Liked · 87%Action Roguelike · Dungeon Crawler
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
3 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.