Gameplay as mentioned, consists of fighting quakes medieval enemies, and there is also a nice custom monster a flying "imp" with a fireball attack, which fits in well to the overall theme and doesn't seem out of place. Another nice touch are the light grey, stone statues placed around the castle, which come to life at key moments and take you by surprise, there is also the custom monster at the main ending...you will see.

The gameplay is well-balanced, and progresses very well, this is one of the key features and strongest points of the map, in my opinion. It starts relatively easy, but significantly kicks up a notch when the lava areas [screenshot above, left] are encountered. This is a nasty hellknights/vore lava section which is finished with 2 tricky fiends. And then difficulty kicks up another level once the smallish courtyard [screenshot above, right] is reached, this may frustrate some players on hard skill, be warned, but cautious, clever play is rewarded eventually, and this leads to a final big open courtyard where lots of enemies are balanced by good supplies of ammo.

I should also comment on the "secret" second ending to the map, a library which leads to a final showdown with the boss lava monster, Chthon. I never reached this ending, [i dont know if its dependent on finding the secrets, i got 0/6], but this is an unusual [off the top of my head i cant think of many other Q1SP maps with two unique, distinct endings], and welcome feature. It certainly increases the replay value of the level significantly, and i shall probably be playing the map again to try and complete it via this second ending.

Overall this map features hard, very well balanced gameplay, interesting atmospheric layout and great extra features [custom monsters, second ending etc], with good attention to monster placement.