Omikron: The Nomad Soul

An Adventure Video Game created by French studio Quantic Dream. Yes, that's the one behind Fahrenheit (2005 video game) and Heavy Rain, and is a game often forgotten to be mentioned in previews, reviews and discussions about Heavy Rain and Quantic Dream's work - which is unwarranted.

The plot concerns you, or more specifically, your soul. You buy a video game that allows your soul to enter another world; the titular city of Omikron.

Said city is a terrifying Dystopia where all human activity is planned by a monolithic super computer named Ix. Ultimately, the player finds out that the reason they are in the city is... well... not what they initially expected. The plot has players go from working for the government to working with a terrorist group to ultimately working their way though a Government Conspiracy that shows The Man Behind the Man is quite horrifying.

A Genre Busting game that incorporates fighting, FPS and RPG elements alongside its adventure, Quantic Dream call the game a "Soul Playing Game".

This Game Contains Examples Of...

 * AI Is a Crapshoot: Ix.
 * Another Dimension
 * Beneath the Earth: You eventually find your way down to Omikron's spacious catacombs.
 * Ancient Tomb
 * City of Canals: Lahoreh, one of the districts of Omikron.
 * Cool Sword: Barkaya'l,
 * Crowning Music of Awesome: having someone like David Bowie to compose the OST of your video game wasn't really common in 1999.
 * The story behind makes it even more awesome. As the game and universe were in an early stage of development, the staff started to think about the music that should go with the whole story. Given that it was a weird alternate universe, David Bowie came on the table pretty often. They finally decided to licence songs from Bowie. A meeting was scheduled at Eidos' headquarters in London between David Cage (head of Quantic Dream) and David Bowie. David Cage told in an interview that he couldn't believe that David Bowie would actually be there. He kept supposing Bowie would cancel. He didn't. But the meeting didn't turn out as David Cage had hoped. David Bowie basically told him that he found the idea of licencing his music for a videogame pretty uninteresting. But that he found the idea of designing the whole music for a videogame was VERY interesting. And that's how David Bowie spent several months in Paris discussing with the game designers to understand the setup, the world, the ambiance of the game, and composed songs in the hotel with Reeves Gabrels based on what he understood. A fine example of artistic collaboration, and a confirmation of David Bowie's openness to novelty.
 * Cyberpunk: Omikron.
 * David Bowie: Provides the soundtrack, alongside regular Bowie collaborator Reeves Gabrels; several of the songs would appear on his album hours.... He also plays TWO characters, who both have his polygonal likeness.
 * Decoy Protagonist:
 * Dialogue Tree
 * Domed Hometown: Omikron, to protect it from an ice age that has engulfed the planet.
 * Dug Too Deep:
 * Dystopia: Omikron.
 * First-Person Shooter: Some segments of the game are played as an FPS.
 * Government Conspiracy:
 * Irrelevant Importance
 * Justified Save Point: Magic rings with the ability to preserve your soul.
 * Save Game Limits: you need to gather said rings.
 * Last Fertile Region: Jahangir Park.
 * Mega Corp: The government-linked trusts, Khonsu and Tetra.
 * No Fourth Wall: One of the earliest examples of this trope in video games. The game begins with a police officer from another world asking you to transfer your soul into his body. It only gets more demented from there.
 * Optional Sexual Encounter: Once near the start of the game.
 * Pamphlet Shelf
 * Peace and Love Incorporated: The Omikron government, which uses thought modifiers.
 * Place Beyond Time: You visit one.
 * Player Headquarters: They get changed a couple of times.
 * Point of No Return: Be sure to stock up before going on the path to confront the Big Bad.
 * Red Light District: Qalisar.
 * RPG Elements: The game includes fighting, First-Person Shooter and Adventure segments, with skill at all these segments being determined by the stats of the body you are currently inhabiting.
 * Save Both Worlds: Both Omikron and the real world!
 * Soul Jar: The player's soul may inhabit the body of several characters. Also,
 * Take Up My Sword: How you obtain the Cool Sword.
 * Tome of Eldritch Lore: The Book of Nout.
 * Urban Segregation: the city of Omikron is divided into four districts, each with its own style of architecture and fashion. People aren't allowed to move freely between them, they need special passes to do so. Only three of the districts are visited during the game.
 * What Could Have Been: Unused dialogue found within the game's data shows evidence that it was originally going to be significantly larger in scale, with several areas increased in size and importance and new ones available to visit (like Omikron's fourth district), along with the inclusion of additional missions and game mechanics. There would have been more Character Development, and some subplots that were left open in the final version would have been resolved. The leftover data also explains a few minor plot holes.
 * Wide Open Sandbox: An early 3D example, you can explore the city of Omikron freely between (and often also during) missions: buy some stuff, read books, listen to music...