Sorry, correct terminology was Shareware,and I still never seen it available in any shop to purchase. Mail Order perhaps? Maybe I had the nine level free Version, actually I still have the discs. It certainly wasnt 1 LEVEL
When Doom Shareware
was first released it crashed the University of Wisconsin's FTP twice! It is also the worlds most installed program. Doom's success could be pined down to having a demo, with 9 levels to play
gamers couldn't resist. And besides if you downloaded it from the internet it was free.
The full version was published in 1993 by id Software.
The Page of Doom: id History
On December 10, 1993, id released its much-anticipated DOOM. DOOM attained phenomenal success and is still recognized as the hottest 3-D action game of all time. DOOM changed the face of computer gaming forever. Recognized as the catalyst and inspiration of what we know now as 3-D action gaming, an estimated 15 million copies have been downloaded around the world, passed from player to player by floppy disk or online networks.
In 1994, DOOM was awarded Game of the Year by both PC Gamer and Computer Gaming World and received the Award for Technical Excellence from PC Magazine.