Undertale™ or Undertale (stylized as UNDERTALE™ and UNDERTALE and formerly UnderTale)[1] is a role-playing game developed independently by Toby Fox with additional art by Temmie Chang in the Game Maker: Studio engine. It was released for Microsoft Windows and Mac OS X on September 15, 2015, and for Linux on July 17, 2016. The game has been met with overwhelmingly positive reviews.