It's funny how the doorway to Book 4 is on the very rightmost edge of the screen. Upon exiting I find myself walking into the right wall of the overworld. Makes me think - is Book 4 the end of the story somehow? Am I rewinding by going to Book 5 and/or 6? (btw: Which to do first? It's interesting that I finally have a choice. I check out the ladder that goes up. I saw it earlier, and its coloured blocks . . . it looks like I need all the jigsaw puzzles complete to get up there. What is up there?)