Original idea! I quite like it, but some of the questions are a bit hard. Maybe I don't remember Scooby Doo as much as I thought I did. I would be nice to no what the link is meant to be for some of them as well.
I didn't like that you pressed the letter and then click the square, I'm not sure what the design choice is about having it the opposite way around?
I did like it over all though! I think it could be a neat phone game