Please, feel free to address the problems with the Blue Balls program, I am the one who programmed it. If you have any doubts on how to use it, or if there is any actual problem or bug, please let me know, and I'll see if there's something I overlooked. By the way, dealing with the individual files for the 8 S&K stages is quite tricky, Blue Balls or not. Basically, it works like this. The data for them is indeed in Kosinski format, but they're saved all together. This means that if you extract the data from the S&K rom, you'll end up with a single binary file with Kosinski-compressed data, which can be extracted to a single binary file with uncompressed data, containing the 8 individual special stages juxtaposed one after the other. So, in order to put a custom special stage in S&K, you have to edit its individual data, reinsert it in the complete uncompressed binary file overwriting the previous data for that stage, recompress the complete file with Kosinski compression (good luck if it becomes bigger than before, since compression is unpredictable), and insert the new Kosinski-compressed file into the S&K rom. Not exactly trivial.