60		Asylum II (DOS, 1985)
60		Last Half of Darkness (Windows, 2000)
60		Inner Demons (DOS, 1996)
60		Buffy the Vampire Slayer: Call of the Siren (Windows, 2002)
55		Choice of Zombies (Windows, 2017)

Notes: Games similar to Don't Knock Twice, Games like Don't Knock Twice, Wales Interactive Ltd., Wales Interactive Ltd., Windows, Adventure, Interactive Fiction, Text Adventure, Horror, 1st-person, PC, Game Similarities.