Snowdin Forest

Snowdin Forest is the second region encountered by the protagonist after exiting the Ruins, coming before the town of Snowdin. It is a wintry forest, filled with canine members of the Royal Guard and some teen rebels from Snowdin. It is also where the protagonist first meets the two skeletal sentries, Sans and Papyrus. Snowdin Forest has several puzzles created by the two, all of which can be solved without too much effort. The Snowman can be found here, who will give the protagonist a Snowman Piece to take to the end of their journey.

Snowdin Forest also has the door that leads to the Ruins; when dining with Sans in MTT Resort, he talks about how he communicates with Toriel through the door. The Mysterious Door can also be found in the forest.

Trivia

 * In the area right outside the Mysterious Door, there is a tiny house seen off the cliff. If the protagonist waits long enough, a person can be seen leaving and entering the house. It is unknown who exactly is seen leaving and reentering, but it is speculated to be Jerry.
 * Along the path just before reaching Snowdin, a sentry sign from the dogs can be found describing humans with the threat color of GREEN, highlighted in RED. This is a reference to the real-life condition of red-green colorblindness in dogs.
 * When passing through trees in Snowdin Forest there are 4 possible shapes that can form on the protagonist's head: a house, a bird, a hat or a dog.
 * If the protagonist returns to Snowdin after completing Waterfall, they can meet the teens mentioned by Gyftrot, and they will tell the protagonist more about Snowy's story

Las Snowdin