Doom v0.5

Doom 0.5 was an alpha version of Doom, released on May 22, 1993 to testers. This version included a number of features in addition to those found in the Doom 0.4 alpha version:


 * Collision detection between objects. It is possible to walk into monsters and pick up items.
 * It is possible to shoot monsters. However, there is still no animation at this stage, and when monsters are shot, they simply vanish.
 * A working status bar and the ability to change the screen size.
 * A working menu.
 * Working platforms.
 * An Automap.
 * Skill levels. The easiest is "I just want to kill", rather than the release version's "I'm too young to die".
 * The rifles sprite has changed, though the bayonet uses the same sprite.
 * A non-functional command line argument to record demos ("RECORD "). Launching the game with it causes the game to get stuck, displaying only a blank screen.

After the player quits the game, the "farewell" screen states that it is a preview of Doom: Evil Unleashed.

Levels


Version 0.5 included several levels, most of which were modified and used in the release version of Doom. Level 6 was held back for Doom II. Unlike the previous alpha versions of Doom, the player could transition between levels.


 * Level 1: not used in the final game
 * Level 2: E2M2
 * Level 3: E2M3
 * Level 4: E1M7
 * Level 5: E3M3
 * Level 6: MAP10
 * Level 7: E1M4
 * Level 8: E1M2
 * Level 9: E1M6
 * Level 10: E1M3
 * Level 11: E2M7
 * Level 12: E1M8
 * Level 13: E2M4

Items
Powerups that never made it to the released version are present in the data files, and are even placed in some of the levels. For instance, the Speed Powerup is placed in the hidden room in the southern crusher corridor of the Containment Area level, instead of the Chainsaw as is the case with Ultimate and registered Doom. Unfortunately, since the code is not present the powerup neither works nor shows up.