Doom/Games using the Doom engine
Id games made multiple games after doom based on the doom engine and earlier additions. Doom Doom2 Heretic Hexen Quake Strife(?)
Zdoom is a Source port made when Id games released the source code for doom and hexen. Zdoom is better than the original doom engine (usually referred to as "Vanillia Doom") because:
Able to pick a game on startup.***
Full Joystick support
Jumping
Looking Up and Down
Mouse Freelook option
Many gameplay options
High Resolutions
Runs better in windows than "Vanilla Doom"
To run zdoom you need one of these files:
You should be able to find some of these in a folder that contains Doom, Doom2, Ultimate Doom, Final Doom, Hexen, or Heretic. If you do not have any of these then you should look for the shareware version of Doom (version 1.9) and put doom1.wad into the zdoom directory.
You need at least one of these files to run zdoom: (doom.wad, doom1.wad, doom2.wad, tnt.wad, plutonia.wad, heretic1.wad, heretic.wad, hexen.wad, hexen2.wad)