L4 2S1E - I thought that was a pretty good puzzle. Its a good introduction to mimics and how to control their movement using walls, and also to managing trapdoors. I don't think I spent much time on this room even the first time through.
L8 2S3E - yeah, that was pretty annoying. It could use some more checkpoints.
L8 7S3E - this is probably the first room I ever got so stuck on, I quit playing for a while. However, I recently played back through KDD, and managed to do this room first attempt with no dying.
L11 1S - it was pretty annoying the first time, but once you find that one odd square of trapdoor, its easy.
L13 2S2W - well, really all of 13 is one big annoying level. But I think you have to divide that by 24 (the number of rooms) to compare it fairly with the rest of the rooms on this list
L15 1S2W - another good puzzle. I think we should distinguish between rooms that are difficult because you have to think far ahead (use a piece of graph paper for instance) and rooms that are simple in idea but take forever to finish because one little misstep sends you back to the beginning.
L17 1S1E - this one was annoying the first time through. But only because I sucked at predicting where tar babies were going to form. The second and third times I played this room, it was easy. It could definitly use a check point over by the the yellow door.
L21 1S1E - if you find the right spots to qw, this room doesn't take that long. I would have nominated 1N1W, 1W and 1S1W on this level as being more tedious.
L24 1S1/2W - sure, but that's two rooms of annoyance instead of 1... you need to divide by 2 to compare
L25 2S - I had a harder time in 1S2W, but this one IS pretty annoying.
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