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Hard Mode is basically Undertale, but it is harder, hence the difficulty. You can start this mode by naming the fallen human “Frisk“. There are some changes. Unfortunately, Hard Mode only lasts until the end of the Ruins. It can be changed after a reset, since it is triggered by naming.


Stronger monsters will appear than normal monsters.

Toriel still might be alive after Hard Mode.

The Annoying Dog will interrupt the fight if you ”kill” Toriel.

Some bosses outside of the Ruins can still get affected by Hard Mode.

(Need more info on this.)