Here is an episode of 14 maps for Doom 2 including various difficulties.
(Some Maps work with vanilla source ports but i recommend using ZDoom or equivalent)
Place Doom2.wad and D2FOE1d.wad in the folder of your favorite source port or create an executable shortcut and enter a command line in the properties of the shortcut:
-iwad DOOM2.wad -file D2FOE1d.wad .
there is no titlepic yet.
Edit: It's ok