this one was the hardest of all of them, I want to throw a book on your pretty face developer, just because the walkthrough don't have the information that 1- you NEED to be a biochemistry to make the story progress, and 2- that you NEED to say that you have to find a DOOR to scape, and not break the barrier, I literally tried 10 times last month, gave up, and came back to see if anyone had a comment to assist with the issue (they did). other than that, this one is very good, not one of the best, but wonderful, very scary!