Games like FUNDAMENTA
Games like FUNDAMENTA include Garry's Mod, GoreBox, Teardown, Aimlabs, and Fireworks Mania - An Explosive Simulator. We matched them by the tags players give FUNDAMENTA on Steam (Software, Sandbox, Solitaire, 3D, and First-Person): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Physics · First-Person

GoreBox
Shared: Sandbox · Physics · First-Person

Teardown
Shared: Sandbox · Physics · First-Person

Aimlabs
Shared: Software · First-Person · Controller

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · 3D · Physics

Totally Accurate Battle Simulator
Shared: Sandbox · Physics · Simulation

People Playground
Shared: Sandbox · Physics · Singleplayer

Fun with Ragdolls: The Game
Shared: Sandbox · Physics · 3D

KovaaK's
Shared: First-Person · Software · Controller

House Flipper
Shared: Sandbox · Singleplayer · Simulation

Goat Simulator
Shared: Sandbox · Physics · Simulation

BONEWORKS
Shared: Sandbox · Physics · First-Person

PowerWash Simulator
Shared: Sandbox · First-Person · 3D

PC Building Simulator
Shared: Sandbox · First-Person · 3D

Nuclear Option
Shared: 3D · Physics · First-Person

Scrap Mechanic
Shared: Sandbox · Physics · First-Person

DrainSim
Shared: Sandbox · First-Person · 3D

CarX Drift Racing Online
Shared: Sandbox · Physics · Simulation

Poly Bridge
Shared: Sandbox · Physics · Singleplayer

Space Engineers
Shared: Sandbox · Physics · Simulation

Internet Cafe Simulator 2
Shared: 3D · Sandbox · First-Person

BeamNG.drive
Shared: Sandbox · Physics · Simulation

Cooking Simulator
Shared: Sandbox · First-Person · Physics

Kerbal Space Program
Shared: Sandbox · Physics · Simulation