The part that I disliked are all the puzzles before level 4 involving the Histachi Brew. I'm going by memory here, but I think you first have to release from prison the alchemist/brewer on level 1, sleep some time to let him move to level 2, go to level 3 and realize that you can't move forward without doing the Seth's Unseeying Eye puzzle for which you have to be a Histachi zombie, go back to level 2 and ask the alchemist to do his research, you sleep some more, but it turns out the library on level 2 has insufficient resources and the alchemist has to move to the alchemical lab. You sleep some more so that he can get there, talk to him again to do his research, get all the ingredients for the Brew which involves talking to the guy bulldozed by the giant boulder on level 2, but the guy wants his sword back on level 3, you get the sword, the guy gives you the location of one of the ingredients (mandrake root), you go to level 1 to get the ingredient, you get all of it, go to the alchemist lab on level 2 and switch ingredients, you sleep some more to pass time, finally get the brew, go to level 3 to do the Unseeying Eye puzzle aaand.... Jesus, you haven't even fought with Thorrasskus yet.