This is the best summary I could come up with:

Nintendo’s Super Mario Maker series of games lets you create your own sidescrolling platformer levels using sprites and 3D objects from several entries in the franchise.

It’s created a deeply devoted fan base, but it’s only ever let you make sidescrolling levels.

The developers, Arthurtilly and rovertronic, describe it as “a toolbox letting you fulfill all of your SM64 dreams.” Just like the Super Mario Maker series, it lets you create your own levels using a special creator interface that borrows a lot from Minecraft, giving you low-res textured (this is the N64 after all) cubes that you can drop in place.

The developers have a guide for doing so (in addition to the video above), and you’ll need an emulator or an actual Nintendo 64 to play the game with the Builder 64 modifications in place.

As Engadget points out, you can do that with a flashcart that supports SD cards — several options are listed in the guide linked above.

Only Nintendo knows what its bar is for taking down projects like this, but it has put emulator developers on edge with some high-profile takedowns lately.

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