A lot of scripted games just aren't that scary anymore (although The Evil Within was pretty disturbing at times). I'm gonna have to say dynamic scary games, because Alien: Isolation is terrifying.
Open world game play (e.g. The Witcher 3: Wild Hunt)
OR
Self contained open level game play (e.g. Hitman, 2016)
Open world game play (e.g. The Witcher 3: Wild Hunt)
OR
Self contained open level game play (e.g. Hitman, 2016)