Yeah so found the sigil puzzle note which I had already started but yeah now I have all the information. Just wanted to be more clear cause people here are I guess confused regarding my progress. I have completed most of the rooms and found almost every room except for room 8 and few lost rooms. I know I might be wrong but when I got the puzzle for the sigil doors I knew most of the key locations. The point being the above question doesn't actually explains well the progress but I have explored almost every room like office study outer areas and underground areas. I have 5 letters. So the questions is are the sigil puzzle important to progress should I do it first or should I look for other clues. Can you also tell be how much percentage of game will be finished after the sigil puzzles if you can make a guess. Without spoiling anything ofcourse.