The Witcher (from Polish: Wiedźmin) is a computer role-playing game for the PC developed by CD Projekt RED STUDIO and published by CD Projekt in Poland and Atari for the rest of the world. The game is based on the book series of the same name by Polish author Andrzej Sapkowski. The game utilizes BioWare's proprietary Aurora Engine. It was released in Europe and North America in October 2007. CD Projekt spent $11 million to develop the game and its Enhanced Edition and as of March 06, 2009, the game has sold 1.2 million copies worldwide.