99		Portal 2 (Windows, 2011)
71		The Turing Test (Windows, 2016)
51		SolarGun (Windows, 2017)
50		Attractio (Windows, 2016)
42		The Lost Vikings (DOS, 1993)
42		Blackhole (Windows, 2015)
40		Norse by Norse West: The Return of the Lost Vikings (DOS, 1997)
40		The Lost Vikings (Windows, 2014)
40		Norse by Norse West: The Return of the Lost Vikings (Windows, 1997)

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