A number of scenarios are not appropriate for normal listing for various reasons. They are listed here under Other Scenarios. They are any of the following: incomplete, plagiarized, pornographic, or specifically made unavailable for download by the designer.
The first group are by the designer Solberg. He designed three scenarios, two of which ("The Leshire Nightmares" and "Sword and Stone") were soon described as plagiarized from Alcritas's scenarios. The details are archived at the Lyceum Boards. Solberg put up no reasonable defense and soon thereafter departed the community in disgrace, leaving only his web page, which may be of historical interest. It is notable that some members of the community (though not many) maintain Solberg's innocence to this day. Play them and decide for yourself.
The next set of scenarios are incomplete. One was released as a demo, which I think means that it is unfinished. It was released, however, so I host it here: Quernick's Quest Demo. Another is incomplete and largely unknown: Corruption. A third such is Derwish Challenge.
Another scenario entitled "Undoomvahgaz Armor" is a utility available only through Zaloopa. You must e-mail him in order to get it, since he has requested that he be given sole ability to distribute this scenario. His contact information can be found at The Doomguard's Realm.
There are at least three scenarios that are generally deemed explicit beyond the restraints of good taste. One such is by Shotts, a designer who in a brief time created a few scenarios that were particularly repulsive. Play only at your own risk: Moderator Land.
The second obscene scenario, Paladin's Sword, by Wild Ali, was an attempt at an "adult" scenario. It turned out about as well as one might expect such a thing to. As above, play at your own risk.
A third such scenario, "Patty's Quest," is currently lost. If anyone still has it, please send it to me.
Frahhamn has made a general statement (not to me) to the effect that several scenarios of his that were released via Aceron's boards were incomplete. One, Revenge, can be found at Alexandria. The other two I keep here: A Problem in Auldrem and Gray Moon II. If Frahhamn would like these removed, he can contact me directly.
The scenario Daughters of Aiyina is wholly contained within the later scenario A Gathering Storm. If you want to see the earlier, less complete version, I host it here.