Mortal Kombat (SNES)

Whereas the original arcade version of Mortal Kombat was controversial due to all the blood and fatalities, the SNES port was controversial due to censoring said items per Nintendo policy. It also gave a huge edge to Sega, whose Genesis had a version that didn't censor at all and even had a blood toggle.

Duplicate Courtyard
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The following needs to be enabled via a Pro Action Replay code:. Bizarrely enough, there are two Courtyard arenas in the game.

This stage shows up after you fight in the regular Courtyard because it follows the pattern of the Game Genie codes where you always fight in a particular stage after the first fight, and it either seems to be 90% complete or a test stage of some sort. Instead of "The Courtyard" on the versus screen, it's called "Throne Room". There is no visible change of the level's look. It doesn't play the typical music track; instead, it actually plays the music that normally plays when you fight Goro! The only thing you can't do on this stage is a Fatality, or the game will go haywire in an ultra-slowdown, then freeze completely. Otherwise, it seems to be fully playable.

Aside from being a test stage, why would there be two versions of the Courtyard? ...And why would the second Courtyard exhibit freezing behavior upon performing a Fatality?

Unused Initials Entry Screen
Game Genie code enables an initials entry screen. While there is a high score table that shows up if you let the game go into demo mode, no initials entry screen pops up if you beat any of the scores.

The programming to display the initials entry screen is located at SNES address. A code block exists at that can reach it. For some reason, this block is located during the Reptile battle intro (right after the "You have found me now prove yourself !!" text is displayed), and will execute if the 16-bit value at is. The address is set to  multiple times during the game, possibly as a way to disable the initials screen?

After entering the initials, the game is programmed to simply continue on to the Reptile battle.

Leftover Build Text
Some leftover build text, most likely related to the sound driver, starts at in the ROM: