42		Perfect (PlayStation 4, 2016)
40		Aquanaut's Holiday: Kakusareta Kiroku (PlayStation 3, 2008)
40		Aquanaut no Kyūjitsu 2 (PlayStation 3, 2008)
40		Aquanaut no Kyūjitsu 2 (PlayStation, 1999)
40		Aquanaut's Holiday (PlayStation, 1996)

Notes: Games similar to Proteus, Games like Proteus, Curve Studios Limited, PlayStation 3, Adventure, Meditative, Zen, 1st-person, Environmental Narrative Games, Walking Simulators, Sony PlayStation, PSX, PS1, PS2, PS3, PS4, Game Similarities.