QRS, there is a secret level in MM, water level. Not Arcade version, but some home system conversion(don't remember which/maybe all). I've only seen a picture in net. That conversion had awful graphics. It was a rumour that arcade version/original had it too, but I (as many other)think that it's not true.(posted 9096 days ago)The trick to enter is(I read this somewhere): At level 1(practice) jump into left side bonus numbers. Then you'll have to wait at exact spot near numbers for a while, then you get into water level.
Maybe if you use enough drugs, you can find your own "secret levels"...
http://www.bodenstaendig.de/marble/ http://www.classicgaming.com/rcatt/tips_mn.html#mmadness http://www.cc.utah.edu/~ss7255/main.html http://netrover.com/~timt/classics/m/marblemadness.html