According to the internets, some guy has managed to hack Super Mario 64 in a way that allows you to play through it with a friend. How does this work? No idea. The link to the mod is in the video description if you want to mess with it yourself. I'm probably going to mess with it, though I imagine that Super Mario 64 is as well-suited to cooperative multiplayer as New Super Mario Bros Wii, which is to say "not really".
So apparently someone made a co-op mod for Super Mario 64
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