Draw Boys, Draw!

Drawing is still a major past-time for the boys. Jack has created a game; some of those pieces are seen below. We're trying to figure out the rules but know the game always ends in flash of lava, acid breath, or being eaten by a monster. At least he is censoring the mature content...see the 4th image from the left (click images to expand).
Luke always gets in on the action, too.
Art is messy but you can't interfere with the passion of the muse!