On December 10, 1993, id Software made ​​available the MS-DOS computer game “Doom” in its shareware version on the first of a series of bulletin boards and an ftp server giving rise to one of the most legendary stories in videogame history. The shareware version included only the first episode, titled “Knee-Deep in the Dead”, while the commercial version offered for sale included two more episodes: “Shores of Hell” and “Inferno”.