Underswap Wikia

ok now ive deleted that garbage here is the real thing.

the neutral route occurs if one of these are true:

the player has not completed a genocide or pacifist before

the player has not befriended Sans, Alphys, and Undyne

the player has killed one, but not all monsters.

the boss of this route is Photoshop/Omega Temmie.

this is always the first route you accomplish without a game editor.

in this route temmie absorbs all 6 human souls and becomes omega/photoshop temmie, making a save file titled Temmietale.