Plays inside your own copy of Marvel's Spider-Man 2, on your device, not in a browser tab. Opens github.com in a new tab.
How to play
Have your own copy of Marvel's Spider-Man 2 (PC) installed: the mashup plays inside it.
Download it from its release page on GitHub (it runs on Windows).
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
Marvel's Spider-Man 2 on PC, Overstrike with .script support, the .NET 7 Desktop Runtime required by Overstrike, and a user-owned US Super Mario 64 ROM. The creator documents launching the mod through Overstrike rather than directly through Steam/Epic.