See Puzzle 3 for most of the instructions. I've added two additional elements here (and I lack the time to properly update the full rules to include them right now): when the loop is completed, all green checkmarks must be inside the loop and all red 'X's must be outside the loop.
I was a year late with my "35" puzzle, so I figured I should be a year early with this one. Of course, some of you may have seen this a year even earlier, as it was a perk in my IndieGogo campaign for my upcoming book. That was, in fact, the reason I crafted it in the first place - otherwise, I wouldn't have bothered. Although I suppose I'm thankful to have endured yet another twelve months, I'm finding little celebratory in this number steadily increasing. Don't expect another one of these six years from now… - ZM