This supposed to be the part of the BHS 1.0 version, but for some reason it became a separate release. Try to find secret stuff, stay alive, and get out...
Random themed levels packed together for one reason, to entertain! Fight your way through several areas of hell even if it's not like that you will ever leave that place.. The variety of level designs try to increase the fun factor, just like the hidden ammunitions and secret areas, look for them whenever you can.
As i am thinking on a continuation of this one, i think you should first play the original 1.0 part. I hope you will like it even if it is a bit old now..
This map pack of mine has several levels to get through, watch this interesting walkthrough made by Paul's Gaming. Very big thanks for him! Have fun :)