Undertale

Undertale is a role-playing video game created by Toby Fox. Players control a human child who has fallen into the Underground, a world underneath the surface of the Earth, separated by a magic barrier. The player meets various monsters during a quest to return to the surface, and can opt to pacify or subdue monsters in order to spare them instead of murdering them. These choices affect the game, with the dialogue, characters, and story changing based on outcomes.