Rubicon. It is a Greatness.
I noticed that since it came out for Aleph One, the Complete Spoiler Guide and the Complete Secrets Guide weren't updated to include stuff like, say, the whole Tycho Plank.
I decided to pitch in myself, five years later, by writing up some Spoilers and tips. I published them as follows:
The Walk-Through - http://www.hierlaw.com/Rubicon.Tycho_Plank_Etc.shtml
Complete Excel List of the Rubicon Levels - http://www.hierlaw.com/RubiconLevels.xls
HTML version of the Complete List of the Rubicon Levels - http://www.hierlaw.com/RubiconLevels.shtml
General Marathon Techniques & Tips - http://www.hierlaw.com/MarathonTips.shtml
In certain secret terminals, I got email addresses for some of Rubicon's creators. Scott Brown and Christopher Lund replied! Brush with Greatness!