Fahrenheit (known as Indigo Prophecy in the United States and Canada) is a video game developed and published by Atari and developed by Quantic Dream. The game was released in September 2005. The game was written and directed by Quantic Dream founder David Cage. According to the official Quantic Dream website, Fahrenheit has sold over 800,000 units worldwide since it was released. Quantic's follow-up Heavy Rain, is somewhat of a spiritual successor to the game, while a full-fledged sequel is currently in development.