Reviews provided by RottenTomatoes
Vincent Canby, New York Times: [It] has the energy to support its elaborateness and the decency to display its devices with style. Something from each of its better models has stuck, and it is pleasant to rediscover old horrors in such handsome new decor. Read more
Dave Kehr, Chicago Reader: Dario Argento's undistinguished Italian thriller was an unexpected hit in 1969, thanks largely, one suspects, to some violent scenes that were unusually graphic for their time. Read more
Roger Ebert, Chicago Sun-Times: Its scares are on a much more basic level than in, say, a thriller by Hitchcock. It works mostly by exploiting our fear of the dark. Read more