Red-Hot Temple

Red-Hot Temple is an unused level found in some personalized copies of Super Mario 64. It is usually reported to be found in Lethal Lava Land, and collecting the star here is awarded as a Castle Secret Star. Various reports have been made on the level and how to collect the star there, with some reporting the level to be a red coin star, while others report facing a harder version of a Big Bully, known as King Bully. The theme here is commonly reported to be a remix of Super Mario All-Stars version of the Underground theme in the original Super Mario Bros, remixed with the instruments of the Lethal Lava Land music.

Description/Geography
There are many reported methods of entering Red-Hot Temple, with some claiming that the anomalous Big Bully's Key unlocks a door near the top of the volcano leading to a pool of red liquid similar to the liquid found to enter Cavern of the Metal Cap in Hazy Maze Cave. Other report seeing two more platforms to jump on and reach the level on the "Elevator Tour in the Volcano" star. The level itself is usually described as an ancient temple area with either red coins, or the aforementioned King Bully.

Missions
As mentioned earlier, the most commonly reported missions are a red coins star, where the red coins are on various levels of the temple. The other most commonly reported star is a boss fight with King Bully, who is also reported to have this text when being fought:

“I was wondering when you would arrive. I’ve seen the mess you’ve caused for my people and I can’t stand by any longer. You’ll now feel the true wrath of justice from me, the King Bully. Just try and knock me into the lava, weakling! Ha!"

King Bully himself is similar to a Big Bully, except he has to be knocked into the lava four times instead of only one. He also has unique dialogue when being defeated:

“Agh! No! How is it that you have won? I’ve pulled every dirty trick out of the hat and I can’t win. Darn. Fine, looks like you win today. Now take the star and get out of here.”

Theorizing
Most people believe that Red-Hot Temple was removed due to seemingly repetitive nature in the red coins star, or the either King Bully being extremely easy despite requiring more hits to be knocked into the lava.

Other reports claim it was a remake of another anomalous level called Lethal Lava Ruins, which was also scrapped. In the end, there would be no subarea in Lethal Lava Land besides for the volcano.