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WadFusion is an active fork of JPL's discontinued WadSmoosh—a tool for merging all of the official classic DOOM games and expansions into one IPK3.

The list of new features added to the fork includes:

• Support for Legacy of Rust.
• Support for the Master Levels rejects.
• Support for masterlevels.wad from the DOOM + DOOM II release.
• Support for the alternate MP3 soundtracks of SIGIL / SIGIL II, with options to switch between MIDI and MP3 music on the fly.
• Support for Andrew Hulshult's IDKFA soundtrack from the DOOM + DOOM II release, which can also be switched on and off on the fly.
• More compatibility options.
• Super ultra-widescreen support.
• A "Full Run" mode that plays all episodes in succession.
• Optional introduction screens with story text from the manuals.
• Many smaller enhancements and bug fixes.

A full list of changes is available in the changelog. The readme contains a full list of supported WADs and and instructions on how to use the tool.

Much like the original WadSmoosh, I do not intend to add support for any unofficial WADs. Some users have already went ahead and started doing that on their own.


WadFusion is a Python 3 script, but a Windows executable is also provided with releases.
Python script (multi-platform)
Windows executable

You should also add support for Heretic, Hexen and Deathkings of the Dark Citadel. Take advantage of the fact that they released the remaster of those games.

Those games won't work with Doom, if that's what you're asking.

SanyaWaffles wrote: ↑Fri Aug 08, 2025 9:27 am Those games won't work with Doom, if that's what you're asking.

But it could serve to merge Heretic with Hexen and their respective addons and thus maintain continuous progress between those games without the need to start from scratch every time. Especially if you play mods like Wrath of Cronos or the Serpent Resurrection RPG Mod.

You might want to check out HXDD for that.

So as of now is this tool not working? I tried it out the other day and the new .ipk3 wouldn't load in one of the newest beta versions of GZDoom.

The current stable version of WadFusion works with the current stable version of GZDoom. If you wish to use Fusion with the GZDoom dev builds, you will also need to use the dev builds of Fusion.

Do note though that GZDoom's recent implementation of tooltips appears to have broken long episode menus, so either downgrade to a dev build from before those changes, or wait for the issue to be fixed.
EDIT: This issue has been fixed in UZDoom.