Hey, thanks for the spot-on questions and the encouragement! You made me remember my initial plan to add a reference to the crowd counting dataset I have used as the ground truth. You can find the link to the dataset in the About page (the ? icon) now. These datasets typically include crowd annotations every image where every person is annotated with head locations (and sometimes the head size) so rendering that was trivial. I actually do show the accuracy of the individual guesses at the end (with the summary of every round) and during the game (with that animated accuracy ruler). It would be great to find out if they are not working properly or not explanatory enough.