Undertale (also stylized as UnderTale or UNDERTALE) is a role-playing video game developed and published by indie developer tobyfox. Creator Toby Fox provided the game's script, design and soundtrack, with additional artwork by Temmie Chang. The game was released for Microsoft Windows and OS X on September 15, 2015.
In Undertale, players control a human child as they navigate the fictional Underground: a large, secluded region underneath the surface of the Earth. The inhabitants of the Underground are called "monsters", a diverse and intelligent group who have been banished from the surface following a war with humanity. The child interacts with many monsters on their quest to return to the surface, with the player making decisions on whether to kill or befriend them. These choices affect the outcome of the game to a large degree, with the dialogue and story outcome changing based on their decisions. At release, Undertale was acclaimed by reviewers, with praise particularly directed at its writing and characters, and intuitive combat system. The game has sold over 500,000 copies, and was nominated for multiple year-end accolades, including Game of the Year from several gaming publications.