Militsioner Co-op · Asterion Studios

This project is in the works. Follow its progress in the Discord.

Co-op for Militsioner, the Unreal Engine 5 demo by tallboys. Up to 5 players share the same world, so whatever one of you does, the others see happen.

Together you can:

talk to the cop
break things and throw them
pick up and loot items
commit crimes
and escape

The goal is the same as the game's: get out of town, only now you have people with you. People have been asking for co-op in Militsioner since 2021, so this mod adds it.

It's still early and being tested and built on. Follow along in the Discord.

This is a fan-made mod. It isn't made or supported by tallboys, and it doesn't include any of the game's own files: you need your own copy of the demo.

How it's made

Game: Militsioner (Demo), made with Unreal Engine 5
Mod framework: UE4SS (RE-UE4SS), the injector and scripting system for Unreal games. It also provided the debugging tools: its live console, its class dumps of the game, and live Lua script execution.
Languages:
- Lua 5.4: the gameplay sync (players, doors, the cop, dialogue, saves)
- C++: the networking module, built with Visual Studio and CMake
- Python: Unreal Editor scripts that build the animation package
Networking: Steamworks SDK (Steam lobbies, invites, Steam's peer-to-peer networking), plus a direct UDP connection for local testing
Animations: made in Unreal Engine 5.8 with the Game Animation Sample and MetaHuman, cooked into a mod package
Testing: two game copies on one PC, the second running under Sandboxie-Plus on a second Steam account

Code and rights

The list above is how the mod is built. The released mod is obfuscated: it comes as secured files that run the mod but don't include its source code, which stays with Asterion Studios only.