A singleplayer mappack – a whole episode, but almost every map is made by a different mapper (beginners and experienced) without knowing the other maps, with only given entrance and exit areas, so that all the maps could be joined in one big episode.
The beginning made me trust it would be a strict middling. I wasn't mistaken. Maps in the first half were kinda awful. But the situation got better later, and the last ones are pretty awesome, especially Kane's ones.
So, I don't wanna talk about some plot and familiar ****, it's mappack only. You can play it, nevertheless some bugs which are obstacles to walkthrough and absence of obvious, such as buttons that trigger doors in the another corner of map.