Multiplayer in GMod is defined by "Game Modes"—community-built rule sets that dictate how the world and players behave.
There are several ways to join or host a multiplayer session in 2026: How to Play With Friends in Garrys Mod (Gmod) - 2025 garrys-mod-multiplayer
The default mode where players use the Physics Gun and Tool Gun to build contraptions, experiment with ragdolls, or create collaborative scenes without strict objectives. experiment with ragdolls
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