Awesome quiz! It's like quizmaster's but with all 50. My problem is that you actually have too much time. I only knew about ~41 without guessing, but I had six minutes to slowly guess and get them all. I'd take away 2 or 3 minutes. Other than that, great quiz!
It doesn't work on some wifi networks, but if you have a private network (not a school one or work one), that might work. I just tried with a mobile hotspot and it worked.