Board Thread:General Discussion/@comment-4504826-20160419213859/@comment-32182236-20170925193003

"Have the Underground expanded and have plenty o' monsters before you meet Flowey so you would be intended to kill them by mistake considering no one told you not to kill up until Flowey guilttrips you."

Hard Mode was intended for those who already finished TP, considering the way to activate it is by entering "Frisk" as a name, a name you only learn at the end of TP. So, the player would likely already know not to kill-They've played before.

"Sans would realize that the reason we want to do the Genocide run is because we want far more harder fights (Like Undyne the Undying and him obviously.) and tried to orchestrate the entirety of Hard Mode to satisify our desiries."

Also, the main reason why we do Genocide is to see what happens-The cool boss fights is something we discover AFTER the run, and make us want to keep going. Nobody remembers a True Reset, so Sans wouldn't remember that we reset away our TP in an attempt to do Genocide. Besides, Hard Mode can activiate even if we don't do Genocide in the Ruins. Chara may have orchestrated it, considering they mention Napstablook missed the memo, however.

I do have my own explanation on why everything's different, but that'll have to wait until we reach that point. Two endings still remain, after all...