About the hidden monitors, there's no need to memorize their positions if you use an emulator. I'm surprised this hasn't been brought up yet. If you enable sprites always on top, or disable the scroll B high layer, the monitors will show up underground. ...Well, I just tested before sending this, and it's very awkward... At first, nothing appeared, then, a static monitor appeared underground once I popped the water shield monitor on the end of AIZ1. I also remember that in some stages, the monitors peak a little. Some people know a lot about how buried monitors work, better than I do. Also, as we're sort of in the topic of randomnesses, how is the bonus stage decided in Sonic 3 and/or Sonic 3 & Knuckles?