Every downloadable mashup on this site works the same basic way: it ships code only, and reads everything else from games you already own. This page covers what they have in common. Each mashup then has its own step-by-step guide.
1. You need your own copies
None of these mods include game files. You need a legal copy of every game involved, installed on your PC. Some need a specific console version too: several Skate 3 mashups read the Xbox 360 version’s default.xex and data folder, dumped from your own disc or Games on Demand copy. An .iso file on its own never works.
Nobody can legally send you those files, and you shouldn’t download them from anyone. If you don’t own the games, try the clean-room tributes instead: they run in your browser and need nothing.
2. Match the game version
Most mashups hook into a game’s executable, so the exact version matters more than anything else:
| Game | Version mashups expect |
|---|---|
| Skyrim | Special Edition on the Anniversary Edition runtime (1.6.x / 1.7.x), not 1.5.97 or VR |
| Fallout 4 | Next-Gen runtime (tested on 1.11.240), not 1.10.163 |
| GTA San Andreas | Classic PC 1.0 US (downgrade a Steam copy), not the Definitive Edition |
| GTA III / Vice City | Original PC releases, not the Definitive Edition |
| Bully | Scholarship Edition 1.200 |
| Minecraft | Java Edition, usually 26.3 with Fabric |
If a mod does nothing at all, a wrong game version is the most likely reason.
3. Mod loaders
Many mashups are plugins for a loader that has to be installed first:
- SKSE64 and Address Library for Skyrim, F4SE and Address Library for Fallout 4
- OWML (Outer Wilds Mod Manager) for Outer Wilds
- me3 for Elden Ring
- An ASI Loader for classic GTA
- Fabric (or NeoForge) for the Minecraft side
Install each loader from its official page, and start the game through the loader rather than the normal launcher.
4. Check before you run anything
- Download only from the project’s own GitHub Releases page, linked from each guide. Re-uploads on other sites aren’t checked.
- Check the release is recent and matches the guide’s version. Several projects publish SHA-256 hashes you can compare with
certutil -hashfile <file> SHA256on Windows. - Windows SmartScreen often warns about new, unsigned launchers. That’s normal for small projects, but it’s also why you should only run files from the source repo.
- Stay offline in games with online anti-cheat. Elden Ring mods in particular must never be used online.
5. Keep your saves safe
Back up your saves before you start, and use a new character or a dedicated save where a guide says so. Most of these mods are a week or two old and change quickly.
6. If something breaks
Every guide lists where the mod writes its log. When you report a problem, open an issue on the project’s GitHub with that log attached. That’s the fastest way to get it fixed, and it helps everyone else.
Guides
- SkyCraft: Minecraft in Skyrim
- FalloutCraft: Minecraft in Fallout 4
- OWCraft: Minecraft in Outer Wilds
- 2010 Rust Rewrite Mashup: MW2, Skate 3 and Minecraft
- ER Mario: Mario in Elden Ring
- BullySkate: Skate 3 in Bully
- GTA San AnSkateas: Skate 3 in San Andreas
- GTA Skate: Skate 3 in GTA III and Vice City
- Killcraft: Minecraft in ULTRAKILL
- Minecraft X Games: Minecraft in RDR2, Cyberpunk 2077, GTA V, PEAK and Ready or Not
- WaW Halo: Halo 3 in World at War Zombies
- MW2 x Risk of Rain 2
- SkateIV: Skate 3 in GTA IV
Want to build one?
A chasm Discord moderator published ai-game-modding-guides, beginner guides to making passthrough mods and Rust rewrites with a coding agent. The GitHub repository has since been deleted; the link is the Internet Archive’s copy from 7 October 2026.