I guess you probably don't need more feature suggestions, but it would be nice if time to completion was based upon when the user viewed the page or downloaded their input rather than when the puzzle unlocks. I solve fairly quickly, but am rarely awake at 5am...

Have some posts about it on my blog. Beacon Sacnner drove me nuts for ages. www.outsidecontextproblem.com/beacon-scann...

Make me sad, but I understand why. Must be a lot of work. I have solved every one so far. An keep looking forward to the next ones.