So let me give some explaining. Fnakj world was going to follow the Fnaf world trend (obviously), however, this game would have Undertale like themes. The Undertale Pizo battle was originally going be the final boss battle for the game, but then I realized how big this project was, and how much glitches would come up. (we don't want another Five Nights at Koopa Jr's 3 now do we?) So ya, thats your explanation.
