- For the track, see Ruins (Soundtrack).
The Ruins is the location where the Undertale Demo takes place, as well as the tutorial area of the main game. The protagonist falls into the Underground from a giant hole in the ground on Mt. Ebott before the beginning of the game. Toriel, a community of spiders, and many other monsters all make their homes here.
Main Story[]
The game begins in the Ruins, with the protagonist standing on a sunlit bed of Golden Flowers.
- For information about Froggit NPCs, see Froggit#Main Story.
After being attacked by Flowey, Toriel takes the protagonist through the Ruins, which is made up of several connecting hallways and rooms, many of which have puzzles and monsters. Partway through, Toriel asks the protagonist to wait where they are, so she can go ahead and finish something. However, the protagonist continues through the Ruins, and traverses to the end of the Ruins to Toriel's home. While navigating the Ruins, the protagonist meets Napstablook for the first time and has the option of supporting the Spider Bake Sale. While they go through the Ruins, Toriel calls them multiple times.
At the end of the Ruins, the protagonist meets up again with Toriel. Toriel brings the protagonist to her home and introduces them to their own room. After the protagonist sleeps in the bed, Toriel leaves a Butterscotch-Cinnamon Pie at the foot of their bed. Afterward, she departs, telling the protagonist to "make [themself] at home." However, the protagonist proceeds to pester Toriel about leaving, prompting Toriel to rush out of her armchair, and rush downstairs. Upon being followed, Toriel tells the protagonist that if they leave the Ruins, Asgore will kill them, and urges them to return. However, the protagonist continues to pursue Toriel, eventually having to fight Toriel to leave the Ruins.
After the protagonist deals with Toriel, the protagonist encounters Flowey, who judges the protagonist on their actions in the Ruins. Afterward, a door behind Flowey becomes accessible, letting the protagonist proceed into the rest of the Underground.