MHServerEmu: a server backend for a game that was switched off
Server emulator for Marvel Heroes
At a glance
- What is it?
- MHServerEmu rebuilds the server side of Marvel Heroes, which was shut down in 2017, so that the original game content can be played again, and the project is explicit that it does not touch the client and does not add new content.
- Who is it for?
- MHServerEmu fits a player who played Marvel Heroes and wants the original content playable again, since the project states that all the systems and content present when the game was shut down in 2017 have been restored, and it fits a reverse engineer interested in MMO server protocols. It does not fit someone looking for the current live game or for new content, because the scope is restoring the original state and there are no plans for custom heroes, team-ups or powers.
- Can I use it commercially?
- Yes, with strict conditions. AGPL-3.0 is a network copyleft licence: if people use a modified version over a network, for example as a hosted service, you must offer them its source code under the same licence.
- Is it still maintained?
- Yes. The repository last received commits 11 days ago.
- What is it written in?
- Mainly C#, according to GitHub's language statistics.
Answers come from the project's GitHub data, last synced on October 22, 2026, and from our analysis. They are not legal advice.
Editorial analysis
What the project is, and the scope it sets for itself
MHServerEmu is a server emulator for Marvel Heroes, and the project's own words about scope are the first thing to read. The scope of this project is restoring the game to its original state, and there are no plans to create custom content, although all of the research on the game is completely open source and could be used by others in such endeavors. On the client side the answer is a flat no: the project does not touch the client side of the game in any way, and this is a recreation of only the server backend needed to run the game. The question of whether the game is fully playable is answered directly, with all the systems and content that were in the game when it was shut down in 2017 having been restored.
The client versions, and how much support each one has
The supported client versions are listed with a support level attached, and the distinctions matter if you have an old client. Version 1.52.0.1700 has full support. Version 1.48.0.1712, which is the pre-BUE release, has preliminary support, as does 1.53.0.203 from the test center, and 1.4.0.26 for PS4. The preliminary versions are built from source using the respective build configuration, and the project is blunt about the consequences. Support for these versions is still very early, and you will likely encounter game breaking bugs, and for now the recommendation is to keep using 1.52 for normal play. There is also early work on version 1.10 from mid 2013, with the code for it in a separate MHServerEmu2013 repository, and the repository root reflects that structure with a separate build script per version in Build_PS4.bat, Build_v48.bat, Build_v52.bat and Build_v53.bat, plus separate solutions for the server and for the tools.
Stable and nightly, and the trade between them
Two kinds of build are provided, and the project gives you a table rather than leaving you to guess. Stable builds update quarterly, carry fewer features, have high stability and run on Windows, and they are pre-configured, meaning just the server files. Nightly builds update daily, carry more features, have medium stability, run on Windows and Linux, and ship just the server files. The recommendation for anyone setting the server up for the first time, or unsure which to use, is to start with a stable build. The upgrade path is deliberately simple, since you can move from stable to nightly by downloading the latest nightly build and overwriting your stable files. The initial setup document is the place to start, and the project publishes development progress reports on its blog with additional information in the documentation directory.
Updating, and the one file you must back up
The update procedure is the same in both directions, download the latest stable or nightly build and overwrite your existing files. The catch is in the nightly builds being potentially unstable, so the project recommends backing up your account database file, which is located at MHServerEmu\Data\Account.db, before updating. That is the only piece of state the project calls out, which tells you something about the design. The server is otherwise configuration and content, and the account database is the part that is yours rather than the project's. A nightly build is a reasonable thing to run for a game you already know, but it is not something to run against a database you have not copied.
The game client, and why there are no downloads
One question gets a direct answer. The project does not provide download links for the game client for legal reasons, and the guidance is that if you played the game through Steam when it was live, you should be able to download it from your Steam library. That is the arrangement the project has chosen, and it is a sensible one for a reimplementation of a commercial title. The rest of the support surface is a Discord server, with setup questions directed to a setup-help channel, and the project invites people who want to discuss the work or help with its development to join. The repository carries a CONTRIBUTING.md and a CREDITS.md alongside the licence, and the top level shows the shape of the codebase with a proto/ directory for the protocol definitions, an src/ directory for the server, a dep/ directory for dependencies, assets/ for the game content, docs/ for the documentation and a Tools.solution alongside the main one.
Where this project is the wrong thing to look at
Two boundaries make it a poor fit for other purposes. The first is scope. If you are after a live service, a modern MMO with a maintained backend, or new content built on top of the game, this is the wrong project, because it is a restoration effort with an explicit refusal to extend the game, and its support level is tied to specific old client builds. The second is the distribution model. There is no packaged server, no container, and no infrastructure story, because the project hands you server files and a set of configuration, which means the operational work of running a long-lived MMO backend, patching, database maintenance and dealing with player data, lands on you. For a research interest in MMO server protocols the open research is genuinely useful, and the reverse engineering work is published in full, but that is a different goal from running a service.
Editorial conclusion
MHServerEmu fits a player who played Marvel Heroes and wants the original content playable again, since the project states that all the systems and content present when the game was shut down in 2017 have been restored, and it fits a reverse engineer interested in MMO server protocols. It does not fit someone looking for the current live game or for new content, because the scope is restoring the original state and there are no plans for custom heroes, team-ups or powers. It also does not fit a Windows-only user on Linux, since stable builds are Windows only and the Linux platform appears in the nightly column. Before you set it up, read the initial setup document, start with a stable build as the project recommends, and back up the account database file before updating, because the FAQ warns that nightly builds can be unstable.
Frequently asked questions
Is Marvel Heroes fully playable with MHServerEmu?
The project states that all the systems and content that were in the game when it was shut down in 2017 have been restored. The scope is restoring the game to its original state, and there are no plans to add custom content such as heroes, team-ups or powers.
Which game client versions does MHServerEmu support?
Version 1.52.0.1700 has full support. Version 1.48.0.1712, the pre-BUE release, 1.53.0.203 from the test center, and 1.4.0.26 for PS4 have preliminary support that requires building from source with the respective configuration, and the project recommends staying on 1.52 for normal play.
What is the difference between the stable and nightly builds?
Stable builds update quarterly, have fewer features, high stability, run on Windows and are pre-configured, while nightly builds update daily, have more features, medium stability, run on Windows and Linux and ship just the server files. The project recommends starting with a stable build if you are setting the server up for the first time.
Where do I get the Marvel Heroes game client?
The project does not provide download links for the game client for legal reasons. If you played the game through Steam when it was live, the client should be available in your Steam library.
Official sources
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