Games like Dummy Guyz
Games like Dummy Guyz include Garry's Mod, Scrap Mechanic, Brick Rigs, People Playground, and Besiege. We matched them by the tags players give Dummy Guyz on Steam (Sandbox, Physics, Multiplayer, Funny, and Building): closest matches first, and among equally close ones the better-known games.

Garry's Mod
Shared: Sandbox · Multiplayer · Physics

Scrap Mechanic
Shared: Sandbox · Building · Multiplayer

Brick Rigs
Shared: Sandbox · Multiplayer · Building

People Playground
Shared: Sandbox · Physics · Funny

Besiege
Shared: Sandbox · Physics · Simulation

Space Engineers
Shared: Sandbox · Building · Physics

Goat Simulator
Shared: Funny · Sandbox · Physics

Totally Accurate Battle Simulator
Shared: Sandbox · Funny · Physics

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

Human Fall Flat
Shared: Funny · Multiplayer · Physics

BeamNG.drive
Shared: Physics · Sandbox · Simulation

Kerbal Space Program
Shared: Sandbox · Physics · Simulation

CarX Drift Racing Online
Shared: Multiplayer · Sandbox · Physics

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

Forts
Shared: Multiplayer · Physics · Sandbox

Wobbly Life
Shared: Multiplayer · Sandbox · Funny

R.E.P.O.
Shared: Multiplayer · Physics · Online Co-Op

Terraria
Shared: Sandbox · Multiplayer · Building

Tabletop Simulator
Shared: Sandbox · Multiplayer · Simulation

Rust
Shared: Multiplayer · Sandbox · Building

skate.
Shared: Multiplayer · Sandbox · Online Co-Op

Teardown
Shared: Physics · Sandbox · Multiplayer

Who's Your Daddy?!
Shared: Multiplayer · Funny · Online Co-Op

PEAK
Shared: Multiplayer · Physics · Online Co-Op