Ultrakill64

What it does

A BepInEx plugin that uses the libsm64 Unity runtime to put Super Mario 64's Mario, with his original movement code, into ULTRAKILL. The creator describes it as a few hours' proof of concept that barely works outside the sandbox and has issues far from the origin or with heavy geometry.

How it works

BepInEx plugin using libsm64-unity

Requirements & limitations

ULTRAKILL with BepInEx; the prebuilt Ultrakill64.dll and sm64bundle from the repository's Build folder; the user's own Super Mario 64 (US) ROM named baserom.us.z64 next to the game executable; played in the sandbox's clash mode.

Original sources

• Source code ↗
• Creator profile ↗
• libsm64-unity upstream ↗

Evidence limits

The GitHub README and file tree were reviewed on 2026-10-08 (prebuilt DLL in the Build folder, no licence file, no tagged releases). No independent catalogue play-test or binary safety review was performed.

Code and releases are linked, not hosted here. Game files and footage retain their owners’ rights.