Tally Ho had to help me there also, Charwood.
I was able to get through the tunnel center doors past the gates, but kept going around in circles after that.
I love your walkthroughs, Doug, and could never do the wonderful job you do on them! But since you did ask for a little constructive criticism.........
I didn't understand which door was the final door to go through in that room. I think your description is great right up to the point of the final door that leads to the next round room. I think the confusion comes from the description of the final door. Since all the doors are triangular, I was confused about what to do after going through the tunnels with the gates in front of them.
I think a better description would be 'the door that was facing you when you first entered the round room, behind the green pedestal puzzle' (or something to that effect), rather than calling it the triangular door. I also thought I was in the second round room when I was in the first so mentioning that the door leads to 'another' round room would have helped me.
Just some thoughts if you're feeling ambitious enough to amend it and agree.