Like more than one of them
23 games close to two or more of Waveform, 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
Sven Co-op
Left 4 Dead 2, but free to play, and half the hours
Loved · 94%FPS · Team-BasedAlso like Garry's Mod
Reassembly
Waveform, but top-down, and 19 times the hours
Loved · 94%Space · StrategyAlso like Garry's Mod
Star Wars: Battlefront 2 (Classic, 2005)
Waveform, but a third-person shooter, and six times the hours
Loved · 95%Space · Sci-fiAlso like Left 4 Dead 2
PlanetSide 2
Garry's Mod, but free to play, and an MMO
Liked · 80%FPS · ShooterAlso like 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
Ravenfield
Garry's Mod, but single-player, and a third of the hours
Loved · 97%Sandbox · FPSAlso like Left 4 Dead 2
Kerbal Space Program
Garry's Mod, but a space sim, and in space
Loved · 96%Physics · SandboxAlso like Waveform
Crazy Machines 3
Garry's Mod, but a puzzle game, and a tenth of the hours
Loved · 95%Physics · SandboxAlso like Waveform
STAR WARS Battlefront II
Waveform, but a first-person shooter, and nine times the hours
Liked · 88%Space · Sci-fiAlso like Garry's Mod and Left 4 Dead 2
Halo: The Master Chief Collection
Garry's Mod, but story-rich, and a third of the hours
Loved · 92%FPS · ShooterAlso like Left 4 Dead 2
Space Hulk: Deathwing - Enhanced Edition
Garry's Mod, but a tenth of the hours, and more divisive
Mixed · 72%FPS · Online Co-OpAlso like Waveform and Left 4 Dead 2
Borderlands: The Pre-Sequel
Garry's Mod, but a looter shooter, and an action RPG
Mixed · 79%FPS · ComedyAlso like Left 4 Dead 2
Evolve Stage 2
Left 4 Dead 2, but sci-fi, and more divisive
Mixed · 70%FPS · Team-BasedAlso like Garry's Mod
Space Farmers
Waveform, but a top-down shooter, and couch co-op
Mixed · 74%Space · PuzzleAlso like Left 4 Dead 2
Marble Mayhem: Fragile Ball
Waveform, but a platformer, and more divisive
Mixed · 67%Puzzle · ArcadeAlso like Garry's Mod
Splitgate
Garry's Mod, but free to play, and an arena shooter
Loved · 91%FPS · PhysicsAlso like Left 4 Dead 2
More like Waveform
2 games closest to Waveform of your picks
Airscape: The Fall of Gravity
Waveform, but a 2D platformer, and 2.5D
Liked · 82%Shoot 'Em Up · Arcade
More like Garry's Mod
5 games closest to Garry's Mod of your picks
Space Engineers
Garry's Mod, but a survival crafting game, and with base building
Liked · 89%Building · Sandbox
Empyrion - Galactic Survival
Garry's Mod, but a space sim, and a survival crafting game
Mixed · 78%Building · 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.