The How to play card reads well in one pass, and the little floor plan with the NO DOOR wall explains the door rule faster than the sentence does. One small thing in the itch embed on a laptop: today's Steady case shows six clues and then "3 more clues below", so it would be easy to start working the grid before noticing the last three. A count in the panel header, like "Clues (9)", might catch that.