Extremely challenging, creative, and well-written. Unfortunately, due to the unusual set of circumstances, I couldn't do it without the walkthrough. Logic wasn't a lot of help. I needed the walkthrough to tell me what I could interact with and where I was supposed to interact with something next.
This was pretty great. A nice story and complex puzzles. It takes a while when you don't use the walkthrough feature, and there are a few times when you might think "How was I supposed to know that?", but a great experience overall.