Murder

Game Overview

Murder is an online multiplayer deduction game inspired by Among Us and the Murder game mode from Garry’s Mod.

Project Context

This project was developed as part of the Online Multiplayer Network Programming course at UQAC in Fall 2025. It is my first online multiplayer project.

My Contribution

I worked primarily solo on this project. All networking-related development was implemented by me.

Server-Authoritative Architecture

The project is built on a server-authoritative network architecture, using Unreal Engine replication and client/server RPCs to handle communication. Critical game decisions are validated server-side to ensure consistency and prevent abuse.

Server-Side Shot Validation

Implementation of a server-side shot validation system. When a player fires, the server temporarily reconstructs the players’ past states, repositions their colliders accordingly, and replays the shot on its side to verify its validity. This approach compensates for latency while reducing cheating opportunities.

Time Synchronization

Development of a custom latency measurement system based on regular RPC exchanges between client and server. These measurements are used to maintain a synchronized time reference between client and server, supporting time-dependent mechanics such as timers.