Game Master is Arma Reforger’s sandbox mode — a real-time scenario editor where one player directs the action for everyone else, Zeus-style. It’s perfect for co-op missions, training and custom events. This guide covers how to use Game Master in Arma Reforger.
What Game Master is
Game Master lets a player create and control a multiplayer experience live — placing units, vehicles, objectives and AI in real time while others play. You can design dynamic scenarios on the fly, command enemy AI, and tweak the world as the session unfolds. It’s the go-to mode for curated co-op and roleplay.
The basics
- Enter Game Master from a Game Master scenario; the editing interface gives you a free camera over the map.
- Place entities — choose units, vehicles, props and objectives from the menu and drop them into the world.
- Control AI — set waypoints, behaviour and orders for the AI you place.
- React live — spawn reinforcements, escalate or ease off based on how the players are doing.
What you can build with it
Game Master is incredibly flexible — co-op missions against AI, training ranges, hostage rescues, convoy ambushes, or full directed campaigns. Because the Game Master reacts in real time, no two sessions play the same, which makes it a favourite for communities running organised events.
Running Game Master for your group
Game Master is best on a dedicated Arma Reforger server — it stays online 24/7 so your group can run events anytime across PC, Xbox and PS5, and one person can prep scenarios while others join. Set it up by selecting a Game Master scenario in our scenario ID picker, and tune AI limits with the performance calculator (AI is the biggest performance cost).
Frequently asked questions
What is Game Master in Arma Reforger?
A real-time, Zeus-style mode where one player places and controls units, vehicles, AI and objectives live to direct a scenario for the other players.
How do I become Game Master?
Join a Game Master scenario and take the Game Master slot — you then get the editing interface and free camera to build and control the scenario.
Does Game Master work in crossplay?
Yes — like other modes it supports PC, Xbox and PS5; just keep the server vanilla if you want PS5 players, since modded excludes PlayStation.
Ready to play?
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