I am stuck in the basement entry of the battle tower, looking for the button to the secret room behind the fake wall for the explosives. Couldn't find it anywere. I looked at a video from the series mentioned elsewhere, it looks like there are wooden supporting beams around the arches, and the button is on one of these. Is this correct? I hope not because I don't HAVE any wooden beams. They're just missing. I wouldn't be surprised as way earlier, a couple of the crucial ladders in the citadel tower were just plain missing as well. I had to reload from an earlier save from way back and fortunately they reappeared.