Plays inside your own copy of Risk of Rain 2, on your device, not in a browser tab. Opens github.com in a new tab.
How to play
Have your own copy of Risk of Rain 2 installed: the mashup plays inside it.
Download it from its release page on GitHub.
Install it as its page says. What it asks for is just below, in the list's words.
Start the game the way its page says: some mashups come with a launcher of their own.
What it asks for
Risk of Rain 2 with BepInEx 5, the player's own Super Mario 64 (US) ROM and a libsm64 sm64.dll (built by the user or via the third-party Melty installer).