Ruins

The Ruins is the location where most of the Undertale Demo takes place. It is a fairly well-sized expanse of dark paths that the player falls into from a giant hole in the ground on Mt. Ebott before the beginning of the game. Toriel, Flowey, and many monsters all make their homes here.

Description
After meeting Flowey for the first time, the player is taken by Toriel through The Ruins, which are made up of several connecting hallways and rooms, many of which have puzzles and monsters. A bowl full of Monster Candy is located early on, and the player meets Napstablook about midway. In the farthest depths lies Toriel's Home, a small nest of spiders having a bake sale, and one room that provides an open view onto what appears to be an old city.

The Ruins' puzzles were perhaps set up by Toriel to keep monsters away from her home at the end of the labyrinth, as she has already grown accustomed to them well enough to have memorized each and every one of their solutions. A small river runs through The Ruins, and the dark ground is hallmarked by small patches of auburn leaves everywhere. One of the trees from which these leaves come from is located close to Toriel's Home.

Residents

 * Toriel
 * Flowey
 * Napstablook