46		Sherlock Holmes: The Awakened (Windows, 2007)
44		Delaware St. John: Volume 1: The Curse of Midnight Manor (Windows, 2005)
43		Sherlock Holmes vs. Jack the Ripper (Windows, 2009)
43		Beasts (Windows, 2004)
43		Beasts (DOS, 2004)
42		Goosebumps: The Game (Windows, 2015)
42		...A Personal Nightmare (Windows, 2009)
41		Fibrillation HD (Windows, 2017)
41		Which (Windows, 2010)
41		Five Nights at Freddy's (Windows, 2014)
41		Harvest (Windows, 2002)
40		Staircase of Darkness: VR (Windows, 2016)
40		Time of Silence (Windows, 2016)
40		Uninvited (DOS, 1988)
40		...A Personal Nightmare (DOS, 1989)
40		Midnight Library (Windows, 2015)
40		Hektor (Windows, 2015)
40		Five Nights at Freddy's 3 (Windows, 2015)
40		Alone? VR (Windows, 2016)
40		Abandoned (Windows, 2015)
40		Last Half of Darkness II (DOS, 1992)
40		The Park (Windows, 2015)
40		Turn Around (Windows, 2017)
40		CrossSide: The Prison (Windows, 2018)
40		Bonbon (Windows, 2017)
40		A Haunting: Witching Hour (Windows, 2017)
40		Starbo (Windows, 2018)
40		Purgation (Windows, 2017)
40		AFFECTED: The Manor (Windows, 2017)
40		Last Half of Darkness III (DOS, 1993)
40		Paranormal Activity: The Lost Soul (Windows, 2017)
40		Uninvited: MacVenture Series (Windows, 2015)
40		Inner Voices (Windows, 2017)
40		Deathlike: Awakening (Windows, 2016)
40		Erusal (Windows, 2016)
40		Cold Dreams (Windows, 2015)
40		VERGE:Lost chapter (Windows, 2015)
40		A Wolf in Autumn (Windows, 2015)
40		Morphine (Windows, 2015)
40		A Mother's Inferno (Windows, 2011)
40		Lumber Island - That Special Place (Windows, 2015)
40		123 Slaughter Me Street (Windows, 2015)
40		Gothos (Windows, 1997)
40		Zaphie (Windows, 1999)
40		Pineview Drive (Windows, 2014)
40		One Night at Flumpty's (Windows, 2015)
40		SCP-087 (Windows, 2012)
40		Dark Night (Windows, 2016)
40		The Dark Eye (Windows, 1995)
40		Bunker 16 (Windows, 2014)
40		The Interview (Windows, 2014)
40		Five Nights at Freddy's 2 (Windows, 2014)
40		Sad Satan (Windows, 2015)
40		Affected: The Horror Experience (Windows, 2014)
40		Slender: The Arrival (Windows, 2013)
40		The 4th Wall (Windows, 2012)
40		Under Zero (Windows, 2016)
40		Sacred Line (Windows, 2013)
40		Directionless (Windows, 2016)
40		The Static Speaks My Name (Windows, 2015)

Notes: Games similar to Beyond the Threshold, Games like Beyond the Threshold, Nacht und Nebel, Nacht und Nebel, Windows, Adventure, Horror, 1st-person, Wintermute, PC, Game Similarities.