This is a really good one I’d happily watch again and suggest to others. The beginning isn't fantastic; it has a purpose, sure, but honestly, I think the film could have begun in Samuel L. Jackson’s office without losing anything. After that initial section, though, the suspense builds exceptionally well. It creates a feeling like something is stalking you, slowly toying with its prey. It's disorienting in a good way, and that comes down to John Cusack’s performance and the impressive visuals. The conclusion comes close to being flawless; there are a couple of small things that might not work for everyone, but they’re hard to fully grasp. As one character puts it, "It's an evil room."

Source on TMDB