Extreme Multiplayer Lobby – Complete Social Multiplayer Solution for UE5

Extreme Multiplayer Lobby is a fully production-ready multiplayer lobby and matchmaking plugin for Unreal Engine 5, built to work with multiple online subsystems including Epic Online Services (EOS), Steam, and Unreal’s default online subsystems.

It provides a solid multiplayer foundation for co-op, competitive, and large-scale online games, helping you build rich social features without reinventing core networking systems.

Why Extreme Multiplayer Lobby?

• Production-Ready System – Designed for real-world shipped projects

• Multi-Subsystem Compatible – Works with EOS, Steam, and other Unreal Online Subsystems

• Cross-Platform Support – Windows, macOS, iOS, Android

• Blueprint-Driven – Full Blueprint access, minimal C++ required

• Optimized Networking – Efficient session handling and replication

• Modular Architecture – Use only the features you need

• Clear Documentation – Setup guides, examples, and API reference included

Key FeaturesLobby & Session System

Create, discover, join, and manage multiplayer sessions with support for sessions and lobbies, real-time lobby updates, host migration, session persistence, public/private visibility, presence support, and optional voice chat.

Matchmaking

Flexible matchmaking system featuring:

• Custom search filters

• Automatic retry handling

• Instant session creation on successful match

• Clean cancellation with proper teardown

Social & Multiplayer Features

• Friends & Presence – Access friends list, online status, and presence data

• Invites – Send and receive game invites reliably

• Lobby Chat – Real-time replicated text chat

• Join via Presence – Seamless joining through platform presence

Player Progression

• Achievements – Track progress, unlock states, and hidden achievements

• Player Stats – Read/write stats with batch support

• Leaderboards – Global and regional ranking queries

Store & Inventory

• Store Integration – Query offers, prices, and descriptions

• Inventory System – Validate and track owned items

Voice Chat

Built-in lobby voice chat with device selection and quality control.

Technical Overview

• Engine: Unreal Engine 5.0+ (5.7 tested)

• Platforms: Win64, macOS, iOS, Android

• Online Systems: EOS, Steam, and Unreal-supported subsystems

• Source Code: Full C++ included

• Blueprint Access: 100% Blueprint-exposed

• Replication: Full multiplayer replication

• Documentation: PDF guides + API reference Here

• Documentation Website : Here

Demo Projects

• EOS Example Project here

Requirements

Uses only Unreal Engine built-in plugins:

• OnlineSubsystem

• OnlineSubsystemUtils

No third-party or paid plugins required.