Locations

The Underground is split into memorable regions. Use this hub to jump into area guides. Explore thoroughly — NPCs hide jokes, lore, and quest hooks.

Regions

• Ruins — tutorial purple halls and Toriel’s care.
• Snowdin — snow, puzzles, and skeleton energy.
• Waterfall — echo flowers, spears, and quiet lore.
• Hotland — heat, labs, and MTT showbiz (includes the CORE).
• New Home — the capital and late-story halls.
• True Lab — major spoilers; late peaceful-path science wing.

Travel order on a first run is usually Ruins → Snowdin → Waterfall → Hotland / CORE → New Home. Side villages (like Temmie) reward curiosity.