How To Defeat Mettaton EX In Undertale At the end of The Core region of the game, Mettaton will reveal that every previous encounter with him so far has been a ruse set up by Dr. Alphys.

If the player kills all enemies in the Ruins, they get a â but nobody cameâ message during their next encounter. This means that the player entered the Genocide route and can freely proceed.

Undertale is the kind of game that is as much about the action as the story. Throughout the game, players will encounter some pretty amazing battles.