Geist

The game is divided into levels, which in turn are divided into stages. Each level starts with a cutscene and has one or more boss fights. The game saves automatically after each level. A level is progressed through by completing its stages.

A stage can be a period in the game in which the player has to puzzle and/or fight his way to a certain point or can be a boss fight. Upon completing a stage, a new checkpoint is reached.

John Raimi, a civilian scientist and member of counter-terrorism team CR-2, is sent to investigate the Volks Corporation in Southern France and retrieve undercover agent Thomas Bryson, Raimi's best friend. After meeting with Bryson, an alarm goes off forcing CR-2 to battle their way out, suffering casualties. Suddenly, one of the agents becomes possessed and kills the rest of the team, with the exceptions of Raimi and Bryson, with the fate of the agent left unknown. Raimi is then captured and has his soul removed from his body, with Alexander Volks himself attempting to brainwash him to create a new soldier for Project Z. Before this can happen, a spirit named Gigi frees him, and after being taught the basics of being a ghost, sets out to regain his body and save Bryson.

Eventually, he finds and damages the machine used in ghost separation right before Bryson and his soul are separated. In the chaos that ensues, Rourke, head of Volks' military department, orders that a "catalyst beam" be fired at the machine, resulting in monsters to emerge from a rift that forms. Raimi then goes and heads towards a compound, noticing that the escaped creatures from the rift roam inside it, killing anything not from their world.

Work on Geist started in 2002. Its early working title was Fear. N-Space learned that Nintendo was interested in a first-person shooter action game with a unique feel to it. n-Space came up with the idea of making a game with an invisible man as the protagonist. From there, the concept changed from being an invisible person to being a ghost and Poltergeist.

After about eight months of work, n-Space finished the prototype, that had originally ran on an Xbox Game development kit, and sent it to Nintendo of America, from which it was sent to Nintendo. Nintendo latched onto the game, and it was decided N-Space and Nintendo would work closely together to develop the game. After six months, object possession was introduced in the game after some suggestions from Shigeru Miyamoto. Geist was first shown to the public at the E3 2003 and it was later stated that Geist would be released the same year.

Geist was Nintendo's E3 2003 surprise announcement, as it was not a new title from one of their staple franchises and no rumors about it had been going around before the E3 2003. In general, people were enthusiastic about the demo.

Two years later, the game received “mixed and average" reviews according to the review aggregator website Metacritic. While the game was praised for its originality in ideas, gameplay, and story, it was held back by a weak engine (IGN: "Unfortunately, a game engine incapable of matching n-Space's ambitions occasionally hampers the experience.") which meant Geist was unable to maintain a smooth frame rate throughout the first-person shooter sequences. The game suffered from sluggish shooter controls that were not on par with other first-person shooters of its time.