The greatest video game of all time, and perhaps the greatest work of art, period.
Not only a milestone in the 'cinematic game' but one which pulls you into its inescapable (foggy) atmosphere and makes you complicit in the mystery of Mary Sunderland.
Every detail about this game unnerves on a profound level, from the illogical level design and subtle ambient hums to the distinctly Lynchian dialogue and even lines of description: 'The door that wakes in darkness, opening into nightmares.'
On top of that, the soundtrack to this one is not only Akira Yamaoka's best work but just one of the all time greats.
There is, quite simply, no other work of horror so concise and masterful.