Mario Kart 64 Hack - Freeing Marty The Green Thwomp from jail and making him a playable racer!

Update 04/27/2020: No more need to input the Gameshark code. I have created a rom patch for this hack that can be downloaded here: https://drive.google.com/open?id=1xMZ...

In Mario Kart 64 there is a green thwomp mysteriously locked behind bars in Bowser's Castle. He has been unofficially named Marty and has been the subject to longstanding rumors that he can actually be unlocked as a playable character. Several hoax and April fools joke images and videos have popped up over the years supposedly showing the convoluted things you need to do on the track in Bowser's Castle to unlock Marty as a playable character.

Well now you can finally race as him with this hack! The current version works only in Bowser's Castle for Player 1 but it works for all engine classes and in both Time Trial and VS. mode (so you can play your friends as Marty).

You can find the (long) gameshark code and the assembly code that makes it work here:
https://docs.google.com/spreadsheets/...

Copy the Gameshark code into your favorite emulator, or if you have the patience you can type it into a real Gameshark. I haven't tested that yet on a real console, but I don't see why it wouldn't work.

I would like to thank micro500 (   / pjgat09  ) for help with the assembly code.

A few interesting things I noticed when making this hack:
-Marty's green color isn't caused by the lighting in his cell. The developers purposely shaded him green instead of blue.
-Marty's behavior differs a bit from the other thwomps. He normally keeps his eyes closed but driving up to him makes him laugh at you.