Board Thread:General Discussion/@comment-31981697-20170722123329/@comment-32182236-20171026162918

We'd have no way of knowing whether the rest was a joke or not, and therefore shouldn't take it as fact. Sure, we can look at the theories, but at the end of it all, they're just speculation. Just like the video. Without any real way to distinguish the truth from the nonsense, we shouldn't just consider anything in there absolute fact-Especially not when doing so would create a paradox, which debunks the (possible) theory.

Temmie and Guzusuru helped with the art and sprites. Flashygoodness and Leon Arnott helped with the programming. But those two people aren't Toby, so these credits show that Toby did not do all the programming. Here they are again: https://drive.google.com/drive/folders/0B6gS2LPXdIc5SFFxc2RCZEd5RGc

Like I said earlier, if it implied what you said it did, the Halloween Hack would also fit the description, and if the narrator is indeed surprised because it's "the first of its kind", then the game in question is the Halloween Hack. Still not Undertale.