Add-on Doom2 Levels
Have you been playing Doom2 for a while, and would like to see some new scenery for a change? It so happens that there are many, many new levels other than the original 32 that came with the game. There is a giant archive of hundreds of add-on Doom2 levels that you can download and play, for free, hosted by a kind site named www.cdrom.com.
Most of these new levels are easy to use. For the simplest ones, you just download the zipfile you want, and you'll see in the zipfile a file named "something.wad" where the word "something" is the level's name. Unzip that into your doom2 directory. Then, when you are ready to play, you just run Doom2 like this:
doom2 -file something.wad
The ones that are more complicated will come with instructions on how to use them. Most of them are easy tho.
If you would like to visit this gigantic database of levels, for convenience I am putting up links to the Doom2 level FTP directories on ftp.cdrom.com and all of its working mirrors. I am not linking to any files directly, just sending you to the directories so you can choose and download them from the FTP site yourself.
S. Africa ftp://ftp.is.co.za/games/id/levels/doom2/
S. Africa ftp://ftp.linux.co.za/pub/idgames/levels/doom2/