which software did it use?
Shareware
Wolfenstein 3D
 The game was released through Apogee in two sets of three episodes under the shareware model, in which the first episode is released for free to drive interest in paying for the rest. 
what is wolfenstein 3d? A video game what is its plot? The game is based on an American spy who puts efforts to destroy the Nazi regime. when did the game release? May 5, 1992
wiki:19666463
Wolfenstein 3D [SEP] Introduction
"Wolfenstein 3D" features artwork by Adrian Carmack and sound effects and music by Bobby Prince. The game was released through Apogee in two sets of three episodes under the shareware model, in which the first episode is released for free to drive interest in paying for the rest. An additional episode, "Spear of Destiny", was released as a stand-alone retail title through FormGen. "Wolfenstein 3D" was a critical and commercial success and widely considered to be one of the greatest video games ever made. Garnering numerous awards and selling over 200,000 copies by the end of 1993. It has been termed the "grandfather of 3D shooters", and is widely regarded as having helped popularize the first-person shooter genre and establishing the standard of fast-paced action and technical prowess for many subsequent games in the genre, as well as showcasing the viability of the shareware publishing model at the time.