Super International 64

Super International 64 is a now-defunct service that was available for the Nintendo 64. It was accessible via having a copy of Super Mario 64 and using it to connect to the internet via a peripheral that is relatively undocumented, though its name is confirmed to have been the "Marionet Internet Connection Services Device".

Super International 64 took players onto a Nintendo-run and guarded network that allowed users to interact with each other whilst exploring several real-life tourist destinations such as Paris, London, Berlin, and even New York for Japanese players (American players got Tokyo whilst other countries except for the USA and Japan got both Tokyo and New York).

The service started in 1998 with the MICSD peripheral being released in 1997 (likely intended for other unreleased games that'd require the internet for whatever reasons). However, the service mysteriously disappeared in 2000, with the very last recording of this service being surrounded in as much mystery as the service itself.

Service Anomalies
The most anomalous connection to Super Mario 64 that the SI64 had was the very last recording of the service.

Shutdown
On May the 16th, 2000, anyone who tried logging into the service's internet connection, which didn't have many users by this point, would be greeted with what was described as being a 'fairly creepy' 404 screen with many sources saying that it was a darkened screen with text using the Super Mario 64 font saying the following:

"404 Error

The connection was unable to be found. Please check your 'Marionet Internet Connection Services Device' and try again. If this error continues, please contact (unknown number)."

No source has been able to correctly verify what number it was that the screen asked the user to contact. However, one user claims to have done as such back in the day, and uploaded a recording of doing that. The user in question has disappeared ever since and all of their social media accounts are gone but sources have been able to supposedly 'record' through words what it was in the video tape itself that was recorded.

Video Tape
Notice: The following text's sources have been unverified and therefore it is important to take this with a grain of salt before reading.

The video was said to have been uploaded on June the 6th, 2011, with the actual video's contents having been recorded on the same day that the shut-down had supposedly occured.

According to the video, which was uploaded on a now-deleted Youtube Channel that went by the name of "Mario Spieler" (translates from German to English as "Mario Player"), calling the number would result in a technician telling him that the service had been shut down due to a 'severe violation of international rights' occuring. The technician would then proceed to beg the person calling the number to not tell anyone, especially if they had associations with Nintendo of Japan, or Nintendo of Germany.

The person was about to hang up on the guy albeit would indeed promise that he would not tell anybody about the reasoning, but before he actually did, the technician would cite that there was a code and a way to access the service because it wasn't actually deactivated yet and there was still one system available; the one in Germany. The technician's voice by this point was inaudible due to poor sound quality on the video tape. Mario Spieler would then proceed to thank the technician for 'all of (their) help' and would next turn on their Nintendo 64 console. Mario Spieler then did something with their controller on the 404 screen. The screen would turn to a gray-ish screen with text that wasn't readable due to the quality of the video tape itself but sources have claimed that it may have said something along the lines of this German text:

"Willkommen beim deutschen Debugging-Programm! Von hier aus können Sie den Systemdienst erneut aufrufen und den Anpassungsmodus von Mario 64 für interne Eigenschaften aufrufen.

ACHTUNG: Der Missbrauch dieses Programms und der damit verbundenen Systeme führt dazu, dass Ihr Praktikum beendet wird und Sie von Nintendos Liste gestrichen werden."

This approximately translates to in English:

"Welcome to the German Debugging Program! From here you will be able to re-enter the system's service and enter Mario 64's Customisation mode for internal properties.

ATTENTION: Abuse of this program and systems associated with it will cause your internship to be terminated and you will be removed from Nintendo's list."

After this, Mario Spieler presses a button, and it leads to a black screen. 30 seconds later, Mario arrives in some sort of black pit with an invisible flooring, and Mario is trapped in an invisible box. He attempts to push himself out of the box but it fails and a few minutes afterwards a mysterious pop-up screen appears. It is unknown to this very day as to what it was saying but sources say that it may have had something to do with a cancelled internship.

This marks the end of the video with the end being a black screen as well as a mysterious noise coming from the TV, which sounds very similar to white noise, but a lot more silent than one would expect it to be.

Theories
There are many theories about what the video tape was exactly and what it's contents were meant to mean and there are several interesting guesses.

For example, some say that the technician in the video may have been an intern, who got presumably fired after the events of the video unfolded. However, nobody is able to track down as to who the technician was, nor does anyone know of his current job.

Mario Spieler is also a mystery, with the last that has been heard of him being seemingly of a missing blog post on Tumblr regarding the status of the video's upload, and to this very day it is up in the air as to what had happened to both the technician in the video and Mario Spieler himself.