Game Boy Advance

In 2001, a Game Boy Advance version of Doom was released by David A. Palmer Productions. It has several differences from the original game:


 * Simplified levels based on those of PlayStation Doom.


 * No Cyberdemon or Spiderdemon.


 * No E3M9; E2M9 is the original E3M8.


 * All music has been "shifted ahead" (E1M1 uses E1M2's music, E1M2 uses E1M3's music, and so forth).


 * The monsters' blood is green, and the Doomguy's face does not bleed.


 * Monster corpses vanish after a few seconds.


 * A lot of the Hellish imagary has been removed (Impaled bodies, etc.)


 * Ultra-Violence mode is renamed "Nightmare"; true Nightmare mode deleted altogether.


 * The game can only be saved between levels.


 * No animated intermissions.


 * In vanilla Doom, the Tower of Babel appears to be "built" during episode 2: with each intermission screen, the tower becomes a little larger, growing from a foundation to a full tower. This does not happen in GBA Doom.


 * Altered ending text: episode 4's ending screen appears instead of the famous "bunny" ending (probably to avoid an M rating).


 * Demon death sound replaced with Imp death sound.

Doom 2
Torus Games of Austrailia developed Doom II for the GBA, which was published by Activision. The differences between the GBA Doom I and Doom II (besides the maps):


 * All the monsters were present


 * All the maps were present (Though Industrial Zone and The Chasm were split into two maps each, presumabaly to make the GBA handle them


 * The Demon was given it's original death sound.

Differences form the original Doom II not already mentioned:


 * The Super Shotguns shells are flesh coloured, just like the face's blood.


 * Dropped weapons give full ammo


 * The box of rockets gives 10 rockets, not 5.


 * The music tracks "Between Levels" (MAP04) and "Getting too tense" (MAP28) were dropped. In their place was "Into Sandy's City" and "Evil Incarnate", the music to MAP09 and MAP31 respectivly.


 * "I'm Too Young To Die" didn't give double ammo.