WADs in Doom
These wads are designed to be primarily for Deathmatch play, but the author intended for them to be still useful and enjoyable for play by individuals (or even cooperative mode). The designs are most conducive towards exciting Deathmatches, and all levels are relatively compact, but they are set up in such a way so that the other modes of play are still fun and fast-moving.
Here is your chance to take a lovely tour of the subterranian sewer system that exists to fulfil all of Hell's waste disposal needs. But what is that coming out of the pipe?! I guess it is time to take out the trash! Mangle the monsters, clean the sewers out, explore horrific ventilation shafts and find the pipe that will bring you back to the surface.