So this morning I got an Epic in my Daily Challenges. Part of the requirement is that I play World Quiz. Well I have a habit of playing my last few games in the final minutes of the day so one thing that can happen, is you start a game, say World Quiz for instance, at 11:58 pm and you don't submit until 12:00 am, then it accepts your submission (how long after the day change I don't know, maybe only a few seconds). So in this particular case, it treated my World Quiz as a submission at 12:00 am, and then I played today's World Quiz just a few minutes ago and it counted this one as well. So what should be a pretty challenging Epic challenge is actually made quite easy because in this particular case, I got two shots at World and both of them counted.

For fairness' sake, I think this loophole should be closed. Now in my particular case, I would have completed the challenge anyway but I wouldn't want to think I won the badge only because of a bug like this one.