I have not had any questions in a long time (haven't played much lately either), but I just started in on Catacombs HD and have been doing okay until I got to room 16308 and find no way to go any further!
Semi-Native... well, I got through THAT crisis okay, but now, I've got another one! Somehow missed the necessary RED key to get to the next section. I'm stuck in room 16115... see attached screen shot.