Undertale is a unique indie role-playing game created by Toby Fox, where players navigate a world filled with monsters after falling into the Underground. The game is known for its innovative combat system that allows players to choose between fighting or befriending enemies, leading to multiple possible endings based on their choices. The game's charming pixel art style and memorable characters, such as Sans and Papyrus, have garnered a dedicated fanbase. Undertale explores themes of friendship, morality, and the consequences of one's actions, making it a thought-provoking experience that resonates with many players.