99		Portal (Windows, 2008)
71		The Turing Test (Windows, 2016)
51		SolarGun (Windows, 2017)
50		Attractio (Windows, 2016)
43		Blackhole (Windows, 2015)
42		The Lost Vikings (DOS, 1993)
42		The Lost Vikings (Windows, 2014)
40		Norse by Norse West: The Return of the Lost Vikings (Windows, 1997)
40		Norse by Norse West: The Return of the Lost Vikings (DOS, 1997)

Notes: Games similar to Portal 2, Games like Portal 2, Valve Corporation, Valve Corporation, Windows, Action, Puzzle, Sci-Fi, Futuristic, Platform, Comedy, 1st-person, Source, Half-Life, Havok, Female, PC, Game Similarities.