Super Nintendo Entertainment 64

The Super Nintendo Entertainment 64, also sometimes just simply abbreviated as the SNE64, was a cancelled system addition for the N64 that would have allowed games from the SNES to be played on the N64, with advantages. The advantages differed on depending of which game the player would be playing.

The system was only ever showcased in Japan.

Appearance
On the front, the logo and power button can be clearly seen. On the top, in the same area that the logo can be seen in, the Nintendo™ logo can be seen. There is also a cartridge slot for SNES games, as well as 2 buttons, one being for ejecting the system out of the N64, and the other for simply ejecting the cartridges.

On the bottom, although it cannot be seen from the angle presented in the picture above, there is a port that slides into another machine that supposedly adds compatibility to the N64 to be able to run SNES games. What this machine would have looked like is unknown, however, as the only records, being 2 pages of an early version of the instruction manual for The Super Nintendo Entertainment 64, do not showcase the machine whatsoever, and only briefly mention it.

Instruction Manual
On the 10th of February 2021, an instruction manual was found in a former Nintendo Cashier's archive of boxes. The former cashier was simply going through some of their stuff in their basement, and just so happened to find two pages of an early version of the instruction manual for The Super Nintendo Entertainment 64, and felt the need to share it with the world. So on the 12th of February 2021, the cashier shared pictures of the instruction manual online, specifically via a now-closed forum named "Super-Super-Mario!".

After this, many people began going on a manhunt for what is left of this manual, searching through everything they can, whether it be online archives or their very own basements.