Doom v0.4

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

Features visible in the alpha include:


 * A spinning 3D title screen. This was to show the title, credits, story and high score table. This feature was apparently removed before the final version.
 * The renderer includes rendering of areas with different floor and ceiling heights, textured walls and ceilings, and light levels. Sprites area also present in the game.
 * Collision detection is performed against the walls. However, there is no collision detection with objects (eg. monsters).
 * Monsters appear in some of the levels standing in place. They are animated but there is apparently no AI.
 * Weapon animation is present; the weapon bobs during movement and it is possible to shoot. However, shooting does not do anything.
 * A basic status bar appears but does not display anything yet.

Levels
The alpha includes 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.