Don't factor time into the rankings unless you mean overall time from start of the challenge until 3 valid answers are entered (and even that is broken since it

Don't factor time into the rankings unless you mean overall time from start of the challenge until 3 valid answers are entered (and even that is broken since it favors people who have heard about the challenge sooner). There's nothing stopping anyone who really cares from getting the entire challenge ahead of time and then doing their pre-worked-out for-reals answer entries from a new IP address.