Introduction

A human child, Frisk, falls into the Underground, a large, secluded region below the surface of the Earth, separated by a magical barrier. The player's goal is to guide Frisk back to the surface while interacting with the monsters that inhabit the Underground.

Meeting Friends and Foes

Frisk encounters a diverse cast of monsters, each with their own unique personalities and stories. Some are friendly and offer help, while others are hostile and pose a threat. The player's choices in these interactions can lead to alliances, betrayals, or even friendships.

The Battle System

The game features a unique combat system that allows players to spare or attack monsters. This choice system is central to the game's narrative, as it can lead to different outcomes, including the ability to complete the game without killing any monsters.

Multiple Endings

Undertale is known for its multiple endings, which are determined by the player's actions throughout the game. The most notable endings include the True Pacifist route, where no monsters are killed, and the Genocide route, where the player kills all monsters.

Determination

A central theme in Undertale is 'determination', which can be thought of as the will to keep going despite challenges. This concept is woven into the game's mechanics, story, and characters, making it a core aspect of the player's experience.

Sanctuary and Beyond

The game begins in Ruins, where Frisk meets Toriel, who becomes a motherly figure. As the game progresses, Frisk travels through different areas, each with its own challenges and inhabitants, leading to the heart of the Underground.