Amnesia Steam Page

[Sexbad]

Well not particularly off the path - It was still very linear - but there were all extra rooms and extra areas you could explore. The magic about this is that if you were an explorer, it counted how you played as part of the moral choice system, meaning you had to be a person who doesn't care to explore to get the bad dude ending. Apparently. I haven't actually gotten it after three plays through because of my compulsion to look for goodies.