L is real 2401

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About
"L is real 2401" is believed to be the text written on the engraving underneath the star statue in the castle's backyard. It was rumored to hold the secret to unlocking Luigi, with some claiming their personalized copy allowed them to unlock the brother as a playable character, or offer some other form of reward to the player.

Rumors
Many rumors about unlocking Luigi have appeared on the internet over the course of many years. Of course, most of them are complete fabrications, however some are believed to be true, but only in the author's copy of the game. Popular rumors included;


 * Running around the statue 2401 or 64 times
 * Obtaining 121 Stars
 * Going to the other side of the Mirror Room


 * Finding a supposed secret level
 * defeating big chungus

There have also been many other, much more convoluted requirements, most likely completely fabricated with the intent of fooling players into wasting their time.

Trivia

 * Many YouTube videos show their copy of the game with Luigi, mostly as the playable character. However he has seen many appearances as non-playable characters, following the Wario Apparition in the fact he was seen in the game, but not how everyone wanted him to be.
 * The text on the engraving is also believed to say Eternal Star, however the texture is too blurry to know for sure.
 * Luigi has been rumored to be in the elusive 1995 build, playable or otherwise.