Garry's Mod Combat Guide: Master Every Mechanic

Q: Do I need other Source games to play Garry's Mod?

The game runs without them, but Counter-Strike: Source is close to required in practice. Most popular maps and addons use its textures and models, and without it mounted you see purple and black checkerboards and ERROR props everywhere.

Q: What is the difference between the Physics Gun and the Tool Gun?

The Physics Gun moves, rotates and freezes objects but never changes them permanently. The Tool Gun applies actual functions such as welding two props together, attaching a thruster, adding a wheel or posing a ragdoll's face. You use both in almost every build.

Q: Which gamemode should a new player start with?

Sandbox on gm_construct to learn the two tools, then Trouble in Terrorist Town, which has clear rules and short rounds. DarkRP has the steepest learning curve because most of what matters there is server rules rather than mechanics.

Q: How do I save a build I made?

Use the Duplicator tool from the Construction category, or Advanced Duplicator 2 if the server provides it. Saved duplications can be respawned instantly, which matters because a single physics failure can destroy hours of welding.

Q: Is Garry's Mod still updated?

Facepunch still patches it, and the community output on Steam Workshop has never really slowed. The game passed 25.56 million copies sold as of November 2024, which keeps servers populated across every major gamemode.

Garry's Mod combat guide covering every mechanic, advanced techniques, and the strategies that separate good players from great ones.

EarlyGuides Editorial Team

Researched and editorially reviewed. Updated August 12, 2026.

Facepunch Studios released Garry's Mod on November 29, 2006, built on Valve's Source engine and sold with no objectives at all in its base mode. By November 2024 it had sold 25.56 million copies, which makes it the best selling PC exclusive game ever released. Almost everything people actually play in it, from Trouble in Terrorist Town to DarkRP, is Lua written by the community rather than by Facepunch.

Combat in Garry's Mod rewards knowledge over reflexes. Understanding how each mechanic works (and how they interact) is what turns a struggling player into a dominant one. New here? Start with our beginner's guide for the basics.

Core Combat Mechanics

1. Physics Gun handling

Left click grabs a prop or ragdoll, the scroll wheel pushes it away or pulls it closer, and right click freezes it in place. Hold E while gripping to rotate the object, and press R to unfreeze everything you have frozen.

Why it matters: This is the foundation of all combat. Everything else builds on this.

2. Tool Gun categories

Tools sort into Constraints such as Weld, Rope, Axis, Ball Socket, Hydraulic, Motor, Muscle, Pulley, Slider and Winch, Construction such as Balloon, Thruster, Wheel, Hover Ball, Dynamite, Emitter, No Collide, Remover and Duplicator, plus Posing and Render groups. Hold Q to open the spawn menu and select one.

Why it matters: The most underrated mechanic. Players who master this early have a massive advantage.

3. Lua gamemodes

A gamemode is a Lua folder that redefines rounds, roles, weapons and interface. Sandbox ships with the game, and everything else including TTT, Prop Hunt and DarkRP is community code that the server loads.

Why it matters: Unlocks a new layer of gameplay depth once understood.

4. Steam Workshop addons

Workshop replaced the old Toybox system in version 13, so addons install by subscribing rather than by dropping files into the addons folder by hand. Servers push their required content to you as you connect.

Why it matters: The tactical edge that separates average players from advanced ones.

5. Mounting other Source games

Garry's Mod pulls models and textures from other Source games you own on the same account. Without Counter-Strike: Source mounted, a great many popular maps display purple and black checkerboards and floating ERROR text where props should be.

Why it matters: The endgame optimization mechanic. Small improvements here compound into massive gains.

How These Mechanics Combine

Understanding how mechanics interact is where real optimization happens:

Physics Gun handling + Tool Gun categories

Left click grabs a prop or ragdoll, the scroll wheel pushes it away or pulls it closer, and right click freezes it in place. When combined with Tool Gun categories, tools sort into constraints such as weld, rope, axis, ball socket, hydraulic, motor, muscle, pulley, slider and winch, construction such as balloon, thruster, wheel, hover ball, dynamite, emitter, no collide, remover and duplicator, plus posing and render groups. This combination is the core of every effective build.

Lua gamemodes + Steam Workshop addons

A gamemode is a Lua folder that redefines rounds, roles, weapons and interface. Paired with Steam Workshop addons, workshop replaced the old toybox system in version 13, so addons install by subscribing rather than by dropping files into the addons folder by hand. This is why the tier list favors builds that leverage both.

Mounting other Source games as a Multiplier

Garry's Mod pulls models and textures from other Source games you own on the same account. Without Counter-Strike: Source mounted, a great many popular maps display purple and black checkerboards and floating ERROR text where props should be. This system amplifies everything else. The better your Mounting other Source games optimization, the more your other mechanics pay off.

Combat by Build

Each build approaches combat differently:

Sandbox (A-Tier)

Combat approach: Balanced combat style. Key equipment: Physics Gun Primary mechanic: Physics Gun handling

Sandbox offers a solid combat experience. Full setup in our builds guide.

Trouble in Terrorist Town (A-Tier)

Combat approach: Balanced combat style. Key equipment: Tool Gun Primary mechanic: Tool Gun categories

Trouble in Terrorist Town offers a solid combat experience. Full setup in our builds guide.

DarkRP (A-Tier)

Combat approach: Balanced combat style. Key equipment: Weld tool Primary mechanic: Lua gamemodes

DarkRP offers a solid combat experience. Full setup in our builds guide.

Prop Hunt (A-Tier)

Combat approach: Balanced combat style. Key equipment: Thruster tool Primary mechanic: Steam Workshop addons

Prop Hunt offers a solid combat experience. Full setup in our builds guide.

Murder (A-Tier)

Combat approach: Balanced combat style. Key equipment: Wiremod Primary mechanic: Mounting other Source games

Murder offers a solid combat experience. Full setup in our builds guide.

Advanced Combat Techniques

Damage Optimization

Match your equipment to your build's stat priorities
Exploit Physics Gun handling for maximum damage windows
Chain Tool Gun categories and Lua gamemodes for combo damage
Use Steam Workshop addons to create openings

Survivability

Learn enemy patterns before committing to attacks
Install and mount Counter-Strike: Source before you touch the Workshop. A large share of popular maps and addons reference its textures and models, and without it you get purple and black checkerboards plus floating ERROR text where props should be.
Position using Physics Gun handling to control spacing
Save defensive options for guaranteed survival, not comfort

Boss Combat

Bosses test your understanding of every mechanic. See our boss guide for fight-specific strategies.

Phase awareness: Most bosses change behavior at health thresholds
Patience over aggression: One extra hit per opening beats dying to greed
Build preparation: Swap gear and equipment for specific fights when needed

Common Combat Mistakes

Button mashing: Committed attacks have recovery frames. Mashing locks you into animations.
Ignoring Tool Gun categories: This mechanic exists for a reason. Players who use it take significantly less damage.
Wrong equipment for the situation: Check our weapons guide for situational picks.
Not learning from deaths: Every death teaches something. If you don't know why you died, you'll die the same way again.
Overcommitting: Trading hits works in gm_construct but will get you killed in ttt_minecraft_b5.

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