Currently the most prominent "prototype" game with a functioning multiplayer mod community is (also known as Casualties Unknown ).
The Prototype Multiplayer Mod is not a "good" mod in the traditional sense of adding seamless content. It is a broken, beautiful window into what Prototype 3 should have been.
: Periodically (e.g., every 15ms) send your position to the server. When the server sends back another player's position, update the corresponding NPC in your game world. Animation Syncing
One player acts as Alex Mercer while the other controls a Blackwatch Strike Team commander.
Enter the —a fan-driven Holy Grail project that has lived in the space between "impossible dream" and "shaky proof-of-concept" for over eight years. This article chronicles the full story of the multiplayer modding scene for Prototype , from the early networking experiments to the current state of the project, the legal minefields, and what a truly cooperative Prototype experience would look like if it ever crosses the finish line.
If you are looking for multiplayer options for the original Radical Entertainment Prototype games (Alex Mercer/James Heller), no functional multiplayer mod currently exists due to the complex nature of the game's engine. Scav Prototype (Casualties: Unknown) Multiplayer Mod
Most progress is made by reverse-engineering the game’s DLL files. The community on platforms like Discord and Nexus Mods continues to experiment with "Project Rebirth" style initiatives, aiming to stabilize the engine for external connections. What a Finished Mod Would Look Like