Like more than one of them
20 games close to two or more of Intrusion 2, 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
R.E.P.O.
Garry's Mod, but a survival horror game, and a quarter of the hours
Loved · 96%Physics · ComedyAlso like Intrusion 2 and 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
BONEWORKS
Garry's Mod, but in VR, and full of puzzles
Loved · 92%Physics · SandboxAlso like Intrusion 2
Totally Accurate Battlegrounds
Garry's Mod, but free to play, and a battle royale
Liked · 88%Physics · SandboxAlso like Left 4 Dead 2
Sven Co-op
Left 4 Dead 2, but free to play, and half the hours
Loved · 94%FPS · Team-BasedAlso like Intrusion 2 and 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
Generation Zero
Intrusion 2, but open world, and three times the hours
Mixed · 72%Mechs · RobotsAlso like Left 4 Dead 2 and Garry's Mod
Guns, Gore and Cannoli 2
Intrusion 2, but co-op, and gorier
Loved · 94%Side Scroller · Shoot 'Em UpAlso like Left 4 Dead 2
Splitgate
Garry's Mod, but free to play, and an arena shooter
Loved · 91%FPS · PhysicsAlso like Left 4 Dead 2
Mutilate-a-Doll 2
Garry's Mod, but gorier, and a tenth of the hours
Loved · 93%Physics · SandboxAlso like Intrusion 2
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
Counter-Strike Nexon
Left 4 Dead 2, but PvP, and more divisive
Mixed · 67%Zombies · FPSAlso like Garry's Mod
Half-Life 2
Garry's Mod, but story-rich, and a quarter of the hours
Loved · 98%FPS · PhysicsAlso 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 Intrusion 2
3 games closest to Intrusion 2 of your picks
More like Garry's Mod
7 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
Hot Dogs, Horseshoes & Hand Grenades
Garry's Mod, but in VR, and half the hours
Loved · 97%Physics · Sandbox
Fireworks Mania - An Explosive Simulator
Garry's Mod, but a hobby sim, and 3D
Loved · 97%Sandbox · Physics
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.