Just thought I would add another point of view. First off I have completed the tower and as an asuran no less, however this was done at 6am EST on a PST server there was 2 other people in the instance at that time. I made it on my second try after spending almost 4 hours the day before and never even making it to the false chest. My point here is simple:
Yes this puzzle is supposed to be hard and no not every one will be able to do it even in a solo instance status, however I don’t believe that anet relieved the added difficulty of losing sight of ones toon because of the masses of other standing on top of one another.
Should anet nurf this puzzle: No
Should it be a solo instance: Debatable, but I don’t think so
Should the number of people in one instance be lowered: Yes
Again just the opinion of one :-)