I couldn't find a map, so I had to go through the rooms several times. Some puzzles are easy whereas others are hard.
Thanks to the walk through, I was stuck with a 4-digit box and a gem box. Looking at 6-10-8, one would have inputted it straight away or tried its combinations. I couldn't figure out how it became a totally different number in the end. Then, I thought BROUGHT was the clue to the gem box sequence because it had seven letters. It turned out that I had missed the green HERBERT clue.