Discworld MUD
Discworld MUD is a popular MUD, a text-based online role-playing game, set in the Discworld as depicted in the Discworld series of books by Terry Pratchett.
History
The MUD was founded in 1991 and opened to the public in 1992 (receiving continuous updates since then, now thirty years later). Originally containing a small section of the then rather loosely defined Ankh-Morpork, over time more locations have been added as the world has been further described in the book series, and laid out in the map supplements (such as The Streets of Ankh-Morpork and The Discworld Mapp). It now consists of areas that attempt to simulate several big cities (Ankh-Morpork, Bes Pelargic, Genua and Djelibeybi) on two continents, a larger number of smaller towns, and more than a million rooms which form the land between the cities and towns, with markers designating canon cities yet to be built.
The MUD was founded in Perth, Western Australia, by David "Pinkfish" Bennett, Craig "Furball" Richmond, Sean A. "Lynscar" Reith and Evan Scott. It was an outgrowth of another MUD called Discworld II. The MUD ran for...
wikipedia.org 
Cicada 3301 - Wikipédia
Cicada 3301 (de l'anglais voulant dire cigale) est une série de défis organisée sur Internet et mettant en jeu à titre principal des compétences en cryptographie et en informatique. Une série nouvelle de défis a été lancée chaque année autour du 5 janvier en 2012, 2013, 2014 et 2016, dans le but affiché de recruter " des individus très intelligents ".
fr.m.wikipedia.org 
