# OpenMoHAA

> OpenMoHAA is an open-source engine for Medal of Honor: Allied Assault, Spearhead and Breakthrough for Windows, macOS and Linux, with bug fixes, bots and full multiplayer compatibility.

Web page: https://emulationking.com/microsoft/windows/games/medalofhonoralliedassault/ports/openmohaa/
Page updated: 2026-10-26

- Developer: OpenMoHAA Team
- Port type: Reimplementation (The game was rebuilt in new code that plays like the original and loads its data from your own copy.)
- Game: [Medal of Honor: Allied Assault](https://emulationking.com/microsoft/windows/games/medalofhonoralliedassault/index.md)
- AI use: No AI. The project says: “This project requires that all contributions be human-authored.”
- Source code: https://github.com/openmoh/openmohaa
- Runs on: Windows, Linux, macOS

What you need: The files of Medal of Honor: Allied Assault (and optionally Spearhead and Breakthrough), from a CD or the GOG or EA release.

OpenMoHAA preserves and improves Medal of Honor: Allied Assault, the 2002 Second World War shooter by 2015, Inc., along with its Spearhead and Breakthrough expansions. Built on ioquake3 and Ritual's F.A.K.K. SDK, it is fully compatible with the original game's assets, scripts and multiplayer servers.

It runs natively on Windows, macOS and Linux across many processor types, plays both the single-player campaigns and multiplayer, includes all fixes from Spearhead 2.15 and Breakthrough 2.40b, and adds more fixes and features such as bots and a ban system for servers.

The project has not reached version 1.0 yet, so things can still change.

## How to set it up

1. Download the zip or installer for your system.
2. Extract OpenMoHAA into your Medal of Honor: Allied Assault folder (the one with the `main` folder), or follow its install guide to point it at the game.
3. Run `openmohaa`. The install guide explains how to start Spearhead and Breakthrough.

## Latest builds

Download these from the web page: https://emulationking.com/microsoft/windows/games/medalofhonoralliedassault/ports/openmohaa/#download

- for Windows (ARM64): 0.82.1 (2025-08-05)
- Installer for Windows (x64): 0.82.1 (2025-08-05)
- for Windows (x64): 0.82.1 (2025-08-05)
- for Linux (x64): 0.82.1 (2025-08-05)
- for macOS: 0.82.1 (2025-08-05)