System Shock

System Shock takes place from a first-person perspective in a three-dimensional (3D) graphical environment. The game is set inside a large, multi-level space station, in which players explore, combat enemies and solve puzzles. Progress is largely non-linear, and the game is designed to allow for emergent gameplay. As in Ultima Underworld, the player uses a freely movable mouse cursor to aim weapons, to interact with objects and to manipulate the heads-up display (HUD) interface.

View and posture controls on the HUD allow the player to lean left or right, look up or down, crouch, and crawl. Practical uses for these actions include taking cover, retrieving items from beneath the player character and navigating small passages, respectively. The HUD also features three "multi-function displays", which may be configured to display information such as weapon readouts, an automap and an inventory.

Set in the year 2072, the protagonist — an unnamed hacker — is caught while attempting to access files concerning Citadel Station, a space station owned by the TriOptimum Corporation. The hacker is taken to Citadel Station and brought before Edward Diego, a TriOptimum executive. Diego offers to drop all charges against the hacker in exchange for a confidential hacking of SHODAN, the artificial intelligence that controls the station. Diego secretly plans to steal an experimental mutagenic virus being tested on Citadel Station and to sell it on the black market as a biological weapon.

To entice cooperation, Diego promises the hacker a valuable military-grade neural implant. After hacking SHODAN, removing the AI's ethical constraints, and handing control over to Diego, the protagonist undergoes surgery to implant the promised neural interface. Following the operation, the hacker is put into a six-month healing coma. The game begins as the protagonist awakens from his coma and finds that SHODAN has commandeered the station.

System Shock was first conceived during the final stages of Ultima Underworld II: Labyrinth of Worlds' development, between December 1992 and January 1993. Designer and programmer Doug Church spent this period at the Texas headquarters of publisher Origin Systems, and discussions about Looking Glass Technologies' next project occurred between him and producer Warren Spector, with input from designer Austin Grossman and company head Paul Neurath in Massachusetts. According to Church, the team believed that they had made "too many dungeon games"; and Neurath later explained that they were experiencing burnout after the rushed development of Ultima Underworld II. As a result, they decided to create another "immersive simulation game", but without a fantasy setting.

They briefly considered placing the game in modern day, but Church said that the idea was rejected because "it [would] just beg so many questions: why can't I pick up the phone, why can't I get on the train, and so on". Church returned to Looking Glass in Massachusetts, where he, Neurath and Grossman brainstormed possible science fiction settings for the game. According to Spector, the game was initially titled "Alien Commander" and was a spin-off of the Wing Commander series; however, this idea was soon replaced entirely. Spector said that they enjoyed not being attached to an existing franchise, because it meant that they "could basically do whatever [they] liked".

The game sold over 170,000 copies. Maximum PC believed that the game did not reach "blockbuster" status, but was successful enough to "keep Looking Glass afloat". GameSpy's Bill Hiles said: "Though it sold well, it never reached the frenzied popularity of [Doom]". Paul Neurath later said that the game "was not a flop", but that it ultimately "lost money" for the company, which he attributed to its steep learning curve.

Computer Gaming World praised the game's scale, physics system, and true 3D environments; the magazine extolled the presentation of Cyberspace as "nothing short of phenomenal". However, the reviewer believed that the game had "little sense of urgency" and "confusing level layouts". Computer Shopper wrote that, while the game's controls were difficult to master compared to "simple run-and-shoot game[s] like Doom", they were "worth the time and effort". The reviewer noted that the game "grows on you, and it will keep you intrigued for weeks".

In a Gamasutra feature, Patrick Redding of Ubisoft attested that "the fact that so many of System Shock's features are now virtually de rigueur in modern sci-fi shooters is a testament to the influence exerted by this one game". GameSpy argued that the game "is the progenitor of today's story-based action games, a group with titles as diverse as Metal Gear Solid, Resident Evil, and even Half-Life". Eurogamer called the System Shock series "the benchmark for intelligent first-person gaming" and noted that it "kick-start[ed] the revolution which ... has influenced the design of countless other games".

Steven Wright for Glixel said in a 2017 essay that System Shock still is important to gaming today, and that the only reasons it is not considered a "Mt. Olympus of gaming" is due to its lower sales compared to games like Half-Life that sold in the millions, and that at the time it was released, it was difficult for players to adjust to the complex systems in the game compared to straightforward first-person shooters.