I haven't played it in ages, so my memory is fading, but in general, the movies referenced are the clues.
Look up the movie "The Blob" and check what it was vulnerable to. See if you can make one.
The gymnasium was a reason to have showers - for the Psycho connection.
Edit: Once you do get past the Blob, you may get stuck. Last time I played, I was unable to load up the second "round" because at that point you need to be playing a network game (even though you do so solo). That part is broken for me, and won't initialise, perhaps due to a change in the OS.
I haven't played it in ages, so my memory is fading, but in general, the movies referenced are the clues.
Look up the movie "The Blob" and check what it was vulnerable to. See if you can make one.
The gymnasium was a reason to have showers - for the Psycho connection.
Edit: Once you do get past the Blob, you may get stuck. Last time I played, I was unable to load up the second "round" because at that point you need to be playing a network game (even though you do so solo). That part is broken for me, and won't initialise, perhaps due to a change in the OS.