About Undertale, I don't want to spoil it for you, but it was the entire ruins, with a character that commented at the end if you did certain things (which is kind of Undertale's whole quirk)... I'm completely spoiled on the story of Undertale so I don't know how to explain it to you - and it is really a game that you gain most enjoyment from not reading up on...
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Tobias 1102~4Y
I've been trying to get through Undertale for the last week or two; I'll post about it when I'm done. I think I know which bit you're talking about, and that seems a sensible segment for a demo.