easy: black out every square that includes someone you saw live at a show once. so if you managed to actually catch the supergroup version of cobra starship performing, you'd hypothetically get to block out four different squares.

medium: black out a square if you saw someone perform live, but only one square per performance date. so if you saw mcr three times during their more recent tours, you could block out way, iero, and dewees; if you only saw them twice, only block out two of those three.

difficult: black out a square if you saw someone perform live, but only one square per band (or iteration of a band, in the case of patd or others with dramatic lineup changes). so if you saw fall out boy live, no matter how many times you saw them, you can only block out one of the four squares possible. for example, but with a different band, currently if you use an mcr show to black out iero, then you can only black out way is if you attended morrisoncon or were physically in the crowd when he was on stage with deadmau5 or duran duran or something.

nb i created this in html but i deleted the file, thinking i was the only person who would ever be even vaguely interested in seeing it. whoops.