This mod, well, more like a level pack, does not edit any codes or interiors. It only adds things inside the level that make the level different.
Install procedure:
Get a fresh copy of Marble Blast Gold and rename the folder to Marble Blast Screwed Up.
Then, delete all the times in /marble/client/prefs.cs.
Then put the marble folder and overwrite everything.
Downloads
Beginner: www.mediafire.com/?zkzuh42npe7i7qb
Intermediate: www.mediafire.com/?y41a0b0dshlwso6
Advanced: www.mediafire.com/?b2h2je5dd4kcbvz
and I understand how mods will fail.
i'll do this anyway.