Games like Chaos Playground
Games like Chaos Playground include Garry's Mod, Goat Simulator, People Playground, BeamNG.drive, and Totally Accurate Battle Simulator. We matched them by the tags players give Chaos Playground on Steam (Sandbox, Physics, Simulation, Action, and Casual): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Physics · Casual

Goat Simulator
Shared: Simulation · Sandbox · Physics

People Playground
Shared: Sandbox · Physics · Simulation

BeamNG.drive
Shared: Simulation · Physics · Sandbox

Totally Accurate Battle Simulator
Shared: Sandbox · Simulation · Physics

Turbo Dismount™
Shared: Physics · Simulation · Sandbox

House Flipper
Shared: Simulation · Sandbox · Singleplayer

BONEWORKS
Shared: Physics · Sandbox · Action

Cooking Simulator
Shared: Simulation · Sandbox · Physics

Endorphin Vice
Shared: Sandbox · Physics · Simulation

Hot Dogs, Horseshoes & Hand Grenades
Shared: Sandbox · Physics · Simulation

Space Engineers
Shared: Sandbox · Simulation · Physics

Fun with Ragdolls: The Game
Shared: Sandbox · Physics · Simulation

Kerbal Space Program
Shared: Sandbox · Simulation · Physics

Total Tank Simulator
Shared: Simulation · Sandbox · Action

Goat Simulator 3
Shared: Sandbox · Physics · Simulation

Half Sword
Shared: Physics · Simulation · Sandbox

Fireworks Mania - An Explosive Simulator
Shared: Sandbox · Physics · Singleplayer

CarX Drift Racing Online
Shared: Simulation · Sandbox · Physics

Wobbly Life
Shared: Sandbox · Simulation · Casual

Brick Rigs
Shared: Sandbox · Physics · Simulation

Just Cause™ 3
Shared: Action · Sandbox · Singleplayer

Scrap Mechanic
Shared: Sandbox · Physics · Third Person

Bully: Scholarship Edition
Shared: Action · Third Person · Comedy