As the name suggests it's something familiar. I guess you'll find out soon enough. Be careful, there are lots of monsters and it's huge map with 2007 things.. 666 monsters and some lost souls! And as it's a long level, you may want to use IDMUS** cheat/command when the current song starts to bore you... It may take some hour or more to complete...
id Software, Doom, Heretic and Hexen and SargeBaldy for making the Doom Textures For Doom II texture wad
New from scratch
Couple days and nights
You could possibly press some switches before you're supposed to press them, but it doesn't really matter