For all the pea soup-laden razzle-dazzle of its most memorable moments, the 1973 film The Exorcist does not lend itself easily to a video game adaptation. On the surface, it's about a 12-year-old girl possessed by the demon Pazuzu. At its core, however, it's an exploration of science and religion, puberty, and man's struggle for identity in a world of good and evil.