No, I didn't use a walkthrough the first time through, and I'm SO glad I didn't.Using a walkthrough makes it clear that you're playing a game, whereas one of the game's biggest strengths is the ability it gives the player to get lost in what's happening. There are some interesting plot twists where the surprise would be spoiled if you consulted a walkthrough. And part of the fun of this game is figuring out what to do based on limited information ... and then see what results. If you consult the walkthrough ahead of time, you'll get the best possible result, but you'll miss the excitement, the sense of anticipation, and the feeling that what happened is REAL.In Chapter 2, the player is present at an autopsy, and depending on what you do there, you can get one of three different answers: what I think of as the obvious answer, the moderately subtle answer, and the very subtle answer. The first time through, I got the moderately subtle answer, which led to a big surprise at the end of the chapter. I could have read the walkthrough and gotten the very subtle answer, but I'd have missed something cool. That's only one example; there are many others.I've played the game five times, and I enjoyed all five times, but there's nothing like your first time, when everything is new, and you don't know what will happen. I really, really wish I could play it again, NOT knowing what I know now. Please, don't ruin that first-time experience for yourself -- forget the walkthrough!And, if you get stuck, people here are willing -- nay, eager -- to answer questions in order to unstick you; you don't need a walkthrough.