Each room is special. How? They all have no music. I wanted people to play their own music in the background, to give us PCPuzzlers more freedom to music in these levels, not just custom music from really large .zip files of .ogg files. This new revolutionary concept may just be better (and easier than adding) custom music!
I will, however, recommend music for each room.
1: https://www.youtube.com/watch?v=sC0cvwnG0Ik
2: https://www.youtube.com/watch?v=PTS0IpBoO78
3: https://www.youtube.com/watch?v=JvZzctJ1bBU
4 (North): https://www.youtube.com/watch?v=CCnCMHNyny8
5 (South): https://www.youtube.com/watch?v=0iGdLDeyeso
6: https://www.youtube.com/watch?v=GWSc0yGLVAA
7: https://www.youtube.com/watch?v=FAs2duUJpAk
Thanks to Sammy_P for testing!