Geist's main character, John Raimi, is transformed into a ghost by the mysterious Volks Corporation. In his spirit form, he can possess both living creatures and inanimate objects to further his goals. Players might possess a security guard to gain access to his weapons and passwords, occupy a fire extinguisher to startle an unsuspecting worker or inhabit a mouse to slip through a narrow passageway. The game contains dozens of possession possibilities to challenge players' problem-solving skills as they make their way through the chilling, nightmarish tale.

"Geist combines the best elements of an unnerving ghost story with an inventive new approach to game play," says George Harrison, Nintendo of America's senior vice president of marketing and corporate communications. "Gamers will be up all night playing, since it's unlikely they'll be able to sleep."

Make no mistake: Geist, Rated M for Mature, is no campfire ghost story. It begins with a terrifying experiment that rips the spirit from a counterterrorism expert's body and leaves him an ethereal presence wandering the halls of the Volks Corporation. He must use his newfound powers to uncover the secret of the shadowy agency as he encounters other spirits like himself and tries to reclaim his human form.