At last, I made a real playable dungeon, based on the original CSB Prison.
It is not completely finished and some parts are inaccessible.
But I couldn't wait any longer to release at least one small dungeon.
One funny thing : list all the monsters you will encounter in level 3 (level 1 is HoC). How many they are? :)
Replace your graphics.dat with the one from the archive (supplied by Zyx) and you will play this dungeon with the graphics meant for it. (this adaptation is not perfect)