thought they were all OK questions apart from one (which is probably the one you mention) but even that one was pretty easy to guess without taking too much time. I think getting to the end depended on how long it takes you to guess that one.
[Edit: scratch that - just did it again and the one I was thinking of wasn't Q26 I guess if you don't know, you don't know! just got to the end quite easily (having done it once before, although there was one near the end that took quite a few goes to get right!)]
to be honest it was spelling that slowed me down more than anything else