45		SpaceTone (Windows, 2018)
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44		.heartbeats (Windows, 2012)
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43		Wild Island Quest (Windows, 2015)
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42		Heaven Will Be Mine (Windows, 2018)
42		The Silver Case (Windows, 2016)
42		Sixtieth Kilometer (Windows, 2016)
42		Air Pressure (Windows, 2010)
41		Sad City 42 (Windows, 2017)
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41		The Barbarian and the Subterranean Caves (Windows, 2017)
40		Black Pencil (Windows, 2004)
40		Fable of the Sword (Windows, 2018)
40		Heileen: Sail Away (Windows, 2008)

Notes: Games similar to The 39 Steps, Games like The 39 Steps, The Story Mechanics, GSP Software, Windows, Adventure, Visual Novel, 1st-person, Unity, PC, Game Similarities.