"Minecraft N64" or "Minecraft 64" (title given by fans) is a supposedly unnameable experimental N64 game similar to Minecraft, which was developed by Nintendo during 1996 as a secret tech demo never shown.
It wasn't until 20 years after it was revealed in an interview given to Shigeru Miyamoto in 2016, where he said the following:
"I do like Minecraft, but really more from the perspective of the fact that I really feel like that's something we should have made.
We had actually done a lot of experiments that were similar to that back in the N64 days and we had some designs that were very similar. "
It is unknown if it ever existed, as no screenshots or gameplay were revealed.
Due to the bad title, it is possible that for some people it is non-existent or unknown.