Older Versions of Doom

• An Alpha version of Doom, dated February, 1993

• An Alpha version of Doom, dated April 2, 1993

• A "Pre-Beta" Alpha version of Doom, dated May 22, 1993

• A "Pre-Beta" Press Release version of Doom, dated October 4, 1993 (has special BFG)

• Screenshots released around March, 1993

• Doom historic/ files on cdrom.com

• Ian Mapleson's notes on the differences between v1.1 and v1.2

• Doom Downgrade
  Doom 1 Downgrade from Ultimate Doom v1.9 version to Doom v1.1 Registered

  Abstract

  Features
  

  • 3-way L/M/R viewing
  • E1M4 Swastika
  • Barons of Hell and Cacodemons committing suicide if they are hurt by a barrel
  • The so-called lift bug, in which projectiles including monster and player fire could activate platform walk triggers.
  • Lots of other minor differences (see Doom Memorabilia for a sample)