The command line parameters -send and -receive were added.

Many more, including capitalization, spelling corrections, and additional error messages.The 'This version is NOT SHAREWARE, do not distribute!' text was added, to be shown with the registered version.At the text screen of Knee-Deep in the Dead, 'buy' is changed to 'play' in the final sentence.A more stable version of the DOS extender (DOS/4GW).First appearance of gamma correction, which is either on or off.It is possible to play the 1.1 registered IWAD with this version, one must rename this wad to 'doom1.wad', it also mentions that this is the 'commercial version' in the startup screen, rather than registered.The BFG9000 fires many plasma gun shots in a wide field in front of the player.The plasma gun fires red as well as green shots.Functionally is fairly close to the commercial release.Press release beta Main article: Doom press release beta The player has a rifle bayonet for melee attacks.The inactive monsters will disappear when shot.Keys and bonus (point scoring) items are present.Health kits will heal the player, but use graphics from Wolfenstein 3D.Various items are present and can be picked up.The player can be harmed by damaging floors.Thirteen levels are present, including a version of MAP10: Refueling Base.Includes eleven levels, various ones of which are recognizable in an early stage of design.Commands to alter certain level properties such as lighting.Non-interactive status interface that resembles a helmet interior.Monsters ( Imp, Demon, and Baron of Hell) are inactive.One level, a flat level with non-orthogonal texture-mapped walls, is present.

Doom 1 vs doom 4