This is not a game for everybody, but I LOVED it. As other reviewers are saying, it won't hold your hand--the puzzles are pretty darn difficult and usually don't explain themselves. But that's the appeal for me. It's like I really get to be a detective in some movie or something, and I have nothing but my wits to go on. The downside to the difficulty is, of course, you WILL get frustrated from time to time--pretty often, in fact, so if you don't like scratching your head too much, this isn't your game. But the difficulty of the puzzles and having to figure out even what you have to do to figure them out means that you get a huge rush from solving them. Not joking, the satisfaction of solving these things is great, makes ya feel like an extra-special clever lil cupcake. Beating the game made me feel like a genius.
I do want to point out, someof the puzzles require you to give up on the room you're working through, try another route, then come back when you've gained a clue or insight from somewhere later in the game. If you have to come back to a puzzle, it doesn't mean you've failed, and you're probably doing what you're actually supposed to by saving it for later.
The problems I did have were mostly interface ones: when you do get a verbal clue from your character, it is only ever said once, and there's no way of it being logged in a Notes menu or anything, so if you go AFK for a minute at the wrong time or don't have your sound turned on, you can miss the hint completely. The hints usually aren't going to be crucial to solving a given puzzle, though. Also, I wished it was easier to move around the house; because the game is a point-and-click, you walk down hallways by clicking your mouse in the direction you want to go, and the screen changes to the part of the room you're in as you move. There is a map in your menu that gets marked off when you solve the puzzle in that room, and I wanted to be able to "fast-travel" or something similar by clicking on the room I wanted to go to, instead of having to go through the whole house one scene-frame at a time. It IS a point-and-click from the early-2000s, though, so not a lot to be expected there.
Overall, I loved the game, and when I was done, I went and bought another whole package of point-and-click puzzlers from the same company, I liked it so much!