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Blook Acres (/bluːk/)[1] is the area found north of the "Quiet Area" intersection in Waterfall. This area contains Undyne's house, Napstablook's house, Mettaton's house, and the snail farm where the protagonist can play a game of Thundersnail.


  • Blook Acres is separated by three paths:
    • The left path leads to Undyne's house.
    • The middle path leads to Napstablook and Mettaton's houses.
    • The right path leads to the Blook Family Snail Farm.

Main Story

Neutral Route

After interrupting the battle against Mad Dummy, Napstablook leads the protagonist to the "Quiet Area", and from there, they invite them to their house. Napstablook is also present in their snail farm, where he invites the protagonist to play a game of Thundersnail for the price of 10G per game. Some Snail NPCs are also present in the snail farm.

Genocide Route

Napstablook and the snails do not show up at all in Blook Acres, meaning that the game of Thundersnail cannot be played.


Undyne's House

Main article: Undyne's House

The home of Undyne, which is accessible after fighting Undyne and under conditions explained below. The exterior of the house resembles a fish, with a fish mat in front of the house, which is similar to Undyne. Outside is the Mad Dummy, and (if spared) Papyrus after fighting Undyne. Talking to Papyrus triggers the date with Undyne if the protagonist gained no EXP and gave Undyne water from the water cooler in Hotland. After cooking with Undyne, the house catches on fire permanently and becomes inaccessible to the protagonist. Undyne then relocates to live at Papyrus and Sans's House in Snowdin, and Undyne joins Papyrus in his phone calls to the protagonist for the remainder of the game.

Napstablook's House

Napstablook's House location.png

The home of Napstablook, accessible to the protagonist after Mad Dummy's battle. Inside, along with Napstablook, is a fridge, a television, a spiderweb with a flyer for a spider bake sale, a computer open to a music-sharing forum, and three CDs, labeled "Ghouliday," "Spookwave," and "Spooktune." These songs continue to play after the protagonist leaves Napstablook's house. If the protagonist walks in the quiet area while one of these songs plays, a unique encounter with Aaron and Woshua triggers.

Mettaton's House

Mettaton's House location.png

The house next to Napstablook's house, which is unlocked using the Mystery Key. This key can be bought from Bratty and Catty for 600G. Inside is an entirely pink interior, with completely pink and sparkly accessories. There is a pillow on top of a bed, a carpet, a poster, a single window, and a television, which are all inaccessible to the protagonist. There are six diaries on the floor, which detail the story of Napstablook's neighbor, a ghost who wanted to perform and become corporeal. This soul was then put into the body created by Alphys, which became Mettaton.

Snail Farm

Blook Acres location Snail Farm.png

The Blook family business is run by Napstablook. According to them, the place used to have a large amount of business, until their primary customer (assumed to be Toriel) stopped coming. Currently, their only customer is "some hairy guy that shows up once a month"; this customer is assumed to be Asgore, who keeps canned snails in his fridge. The first pen has four snails that the protagonist can interact with, while the second pen, where the protagonist can play a game of Thundersnail, has three racing snails.


  1. In ENG, character name pronunciation isn't clear. But in JP I had to decide. Like, "Blook" rhymes with "Spook" instead of "Hook." - Toby Fox (@tobyfox) on Twitter, July 04, 2017.