I'm curious - if you posted a version of this with, say, 20 minutes (mimicking doing this quiz from a newspaper), how much difference might that make? I suspect the subtle panic I felt cued by "Dash" didn't help me get very many (6).
No doubt the average score would go up, but I doubt anyone would actually spend 20 minutes staring at the screen doing a quiz like this. I wouldn't. It's just a quick thrill to get the mind ticking.