Doom v0.4

Doom 0.4 was an alpha version of Doom released to testers on April 2, 1993. At this point in development, a number of elements had already been completed, and it appears that the main features of the renderer were already in place.

Version 0.4 included the following features:


 * A spinning 3D title screen, which was removed before the release version of the game.
 * The engine could render areas with different floor and ceiling heights, textured walls and ceilings, and different light levels.
 * Collision detection was performed against the walls. However, there was no collision detection with sprites (e.g. monsters).
 * Monsters appeared in some of the levels. Although they were animated, they did not move or react to the player or to other monsters. Early versions of the Lost Soul sprites were included in the WAD file, although they did not appear during play.
 * The player's weapon bobbed during movement and could be fired, although it had no effect on the environment or monster sprites.
 * The game included a basic, but non-functional, status bar.
 * Doors(but not any other moving sector types) work and can be opened with the alt key

Levels
Version 0.4 included 13 levels, some of which evolved into levels used in Doom:


 * Level 1: E2M7
 * Level 2: E2M2
 * Level 3: E2M3
 * Level 4: E1M7
 * Level 5: E1M6
 * Level 6: Not used in the final game
 * Level 7: E1M4
 * Level 8: E1M2
 * Level 9: E3M3
 * Level 10: Possibly E2M4
 * Level 11: Not used in the final game
 * Level 12/13: Mentioned in the accompanying documentation, but were not actually included.