I got 111. Twice I went to choose an answer at the last second, and ended up triggering an answer to the next question. So the odds are that I missed those 2 questions, in addition to the 2 questions I was providing a guesstimate for.
I also thought the phrasing to a couple questions were ambiguous ("You see this sentence reflected in a mirror. How many in the original are back to front.") Must be a British thing.
My final excuse is that I've hardly gotten any sleep for a week because of our newborn, and my brain is fried from working on Varium light spans all day.
[edit] Just read Digby's post. It sounds like we had the exact same problems. I would have stuck an extra blank screen between each question that would give a couple seconds of padding so you don't accidentally trigger answers to the wrong question.
Dan East