Goombas are pretty much at the bottom of the food chain in the Mushroom Kingdom—it never takes much to kill them in a Mario game. But there's one particular Goomba in Super Mario 64 that can't be defeated, no matter how good your platforming skills are.
First, some background. Super Mario 64 loads groups of Goombas in a triangle formation. This is a constant: when you see three Gombas in a level, the game spawned them in a triangle formation. Simple, right?
Player pannenkoek2012—who was the player that finally nabbed the "impossible coin" in Super Mario 64—noticed that while this axiom held true for all levels, it wasn't true for the final Bowser level in the game, Bowser in the Sky. For whatever reason, one of the platforms on this level would spawn what was clearly a triangle-formation Goomba group...except one of the Goombas was missing:
...or so it appeared, anyway.
Just to confirm, pannenkoek2012 broke out a special cloning method that replicates objects in front of Mario. Through this, it could be confirmed that there was in fact a third Goomba somewhere, even though nobody could actually see it:
The community dubbed it the Mystery Goomba. What makes the Mystery Goomba story interesting is that pannenkoek2012 became committed to finding and, if possible, actually killing this this particular Goomba. I mean, think about it. Prior to April of this year, nobody knew this Goomba existed. That is to say: in the 18 years since Super Mario 64 has been out, nobody has ever killed this particular Goomba before. It's easy to understand why suddenly destroying a measly Goomba would become enticing.
So pannenkoek2012 looked into the mystery Goomba more—and, using some hacks, was able to find where on the map it actually spawned. It was no wonder that nobody could find it at first. Turns out, the game spawns the third Goomba on the bottom of the map, where the Goomba is almost immediately killed:
Even when the video is frozen, you can barely see the Goomba—it's a miracle anyone found it at all. Unfortunately it seemed as if there was no way to get close to the Goomba, which only appears when you get close to the Goombas on the top platform and is only visible for a single frame, as pannenkoek2012 explains in this video:
You'd think this would settle things, but no. Months later, pannenkoek2012 came out with a third must-watch video that tested out different ideas for killing the mystery Goomba:
The first method shown is the "instant descent" technique, which allows Mario to teleport to the nearest surface beneath him. Unfortunately, Mario can never use this method in the appropriate spot, as getting anywhere near the Goomba's spawn radius makes the Goomba fall to its death. Bummer!
The second method involves putting something underneath the Goomba, so that it never has the chance to fall down. Nothing on the stage can be placed in the right spot, though. Even when pannenkoek2012 decided to use a glitch to clone items underneath the Goomba with the hope they'd break the Goomba's fall, it didn't help. Either the game won't let the Goomba stand on the surface of the cloned item, or it makes the entire object intangible. No good!
The third method doesn't try to move you or the Goomba anywhere, but rather toys with the idea of attacking the Goomba remotely with a Bob-omb. Unfortunately, if Mario ever is too far away from a Bob-omb, the Bo-omb won't explode. Even using a glitch to try to detonate a Bo-omb from afar won't help in this case, as Mario needs to be close to the explosive for it to detonate—and the entire problem is that Mario can't get close to the Goomba in the first place!
The final and most hilarious method which pannenkoek2012 tests involves a sacrificial Luigi. Interestingly, using this multiplayer hack, the Goomba can actually live past a single frame. This means Luigi can get so close to it, the game renders a fully-formed Goomba—not just a brown smudge on the screen—that you can actually see. And yet, there's still a problem: the Goomba spawns so far down, the player always hits a death barrier whenever he or she tries to jump on top of the Goomba. The Mystery Goomba exists in a place literally beyond a wall of death, where nobody can ever harm it—even if we use hacks.
Amazing, right? Not even Satanic rituals can kill this Goomba. Trust me, pannenkoek2012 has tried.
And so the Super Mario 64 community has gained another white whale after the acquisition of the so-called Impossible Coin. Right now, the chances of anyone ever killing the Mystery Goomba seem slim—but hey, the Impossible Coin wasn't supposed to be attainable, either. Perhaps someday, the Mystery Goomba will be killed.