DOOM's Not Dead... it's getting better
Anyone here an old Doomer. Never had it for my old Amiga, but it was the first game I bought for my PSX back in 95.
The original Doom never died. Fans have worked to update the original game's textures, lighting effects, etc adding new weapons, maps and campaigns.
Here's just one of several free versions... called Brutal Doom... and it's more gory than the original. The creatures have more tricks up their sleeves and better AI. Review here: https://www.rockpapershotgun.com/2015/06/08/brutal-doom-v20-released/
Download here: http://www.moddb.com/mods/brutal-doom/downloads/brutal-doom-hell-on-earth-starter-pack
It comes as a zip file which you should unzip it to some place you can find. The game is portable, needing no installation. Just click on the gzdoom - PLAY BRUTAL DOOM.exe link.
There's a manual in the folder.... but it might be best to just try playing it. Movement is with the w/a/d/x keys.... E is the action key to open doors. Hint to get out of the first room you need to kick or shoot the switch. To change weapons... once you get new ones.... use F1, F2 keys. Game files from older versions can be added to the folder and played.
I believe this game can be played on line.