It is considered one of the best video games ever made and it still confounds fans.

'Super Mario 64' for the Nintendo 64 console was a marvel of three-dimensional level design when it was released in 1996. But a few strange elements found their way into the boards, despite the amazing work of Nintendo's legendary designer Shigeru Miyamoto.

There was a coin that seemed impossible to get, placed beneath a ledge on the "Tiny-Huge Island" level. One fan, known as "pannenkoek2012" on YouTube, found a way.

And now there is another mystery for "pannenkoek" to turn his attention to: a Goomba minion impossible to kill.

Interestingly, this enemy is found on the final level of the game, where you have to fight Bowser, named "Bowser in the Sky." "Pannenkoek" noticed that despite the fact that every other level in the game loads up Goombas in groups of three, there were only two visible in this last board. One cheat confirmed that the third Goomba existed somewhere out there.

Using many different computer tools, he finally noticed a brown dot all the way down, at the bottom of the pit below the platforms of the level. This brown dot is a placeholder graphic for a Goomba. The game loads it up, but then it falls to its death and is not approachable.

His video on this mystery goes on to explain what makes the situation so complex and why this Goomba is impossible to get to. Of course, he has done the impossible before...