Scratch that.. actually all PC would do is say "this is a level, it should go in episode" and then it will ask you if you want to put it in the episode folder.
But you can run it in a command line.. like so:
Put the Goo file into its own sub folder in the MotS directory. Then in a DOS box or at the run command prompt, type:
c:\MOTSFolderName\jkm.exe -path SecretLevel
Where "SecretLevel" is the name of the directory you put the Goo in.
Then it should load up with the file. If that doesn't work, then I don't know.. you shouldn't have to do that, it should be selectable from the menu after you select "Single Player" if you installed it correctly.
Btw, go ahead and upload the level and post a link.. if not, I will tomorrow when I get a chance.
[This message has been edited by Kurgan (edited January 27, 2001).]