The Ghostrunner accesses the remaining Cybervoid systems, the digital network connecting Dharma Tower, and the foundation upon which the Architect's intelligence is supported. Doing so allows the Architect to correct damage to the Ghostrunner's code.
The Ghostrunner is contacted by Zoe, a surviving Climber who aids the Ghostrunner in his journey to defeat the Keymaster. Zoe also names him 'Jack’, a codename the Climbers used while they attempted to make repairs.
Mara disables the air filtration systems of the district the rebellion took place in, which would result in all residents of the district dying to the radioactive dust present in the Outside atmosphere. The Ghostrunner complies with Zoe's request that he reinitialize the turbines to the Architect's dismay, who considers such matters a distraction.
The Ghostrunner uses the Amida elevator to reach Dharma City, the Tower’s privileged region. The Ghostrunner moves to access the Repository, a secured Cybervoid server containing pre-Burst information, as well as some data on Project Ghostrunner.
Zoe notices a distortion in monitoring systems which turns out to be a facsimile of the Ghostrunners built by Mara, who originally collaborated on their design. The unit steals the data, forcing the Ghostrunner to defeat it to gain the upgrades stored in the data.
During their fight, the Keymaster announces to the Architect and his “puppet” that when the Ghostrunner is defeated, she will destroy all remaining Cybervoid systems, removing the Architect intelligence.
The Ghostrunner then proceeds to the Core, the heart of the Keymaster's power. The Architect continually expresses disdain for the Ghostrunner's camaraderie with Zoe, and considers the Ghostrunner's willfulness to be a deficiency from the perfect weapon the Architect intended.
While the Ghostrunner traverses the Core, Zoe receives a distress signal, causing her to leave her safe area in the hopes of rescuing a fellow Climber, despite the Ghostrunner suggesting that it could be a trap. Nevertheless, she bids farewell to him.
The Keymaster addresses the citizens of the Tower directly, explaining her end goal: invasively modifying the human body to be able to tolerate the conditions of the Outside, allowing humanity to leave.
The products of her research are indeed capable of this, but the nature of the augments would damage their minds, leaving little that can be recognized as human. The Ghostrunner stumbles upon a final Cybervoid server, and gains the ability to hack the ubiquitous 'Atma' neural implants of his foes.
This capacity causes the Ghostrunner to realize the Architect had the ability to control people, and comments that the Architect is worse than Mara. As the Ghostrunner closes in, Mara addresses him and the Architect, who she considers monstrous and demonic.
Mara realizes the only reason why the Ghostrunner would have saved the sector from earlier instead of continuing his journey to confront her is because the Ghostrunner was not perfectly obedient, and attempts to convince him that the Architect is little more than an insane machine. When the Architect silences her, the Ghostrunner realises the Architect has been lying about his capacities within the Tower.
The Ghostrunner reaches and finally defeats Mara, upon which the Architect forces the Ghostrunner into Cybervoid due to the Architect’s strength increasing when the Ghostrunner interacted with the Cybervoid servers, with him intending to completely assimilate the Ghostrunner into itself as the Ghostrunner is now independent and sentient.
The Ghostrunner resists and traverses the landscape, as the goal of both the original Adam and the Architect is revealed to be complete control of humanity. The Architect considers this for the greater good, while the Ghostrunner considers Mara's initial coup to have been correct.
The Ghostrunner reaches the manifestation of the Architect, who notes that without him, Cybervoid will cease to exist, killing the Ghostrunner. The Ghostrunner destroys him anyway, telling the Architect that his name is Jack. Zoe narrates the epilogue, stating that humanity was now free to choose its own path without being controlled by the delusional Architect or Mara. She expresses gratitude for Jack, who is hinted to be re-activated.
Polish developer One More Level worked with 3D Realms to create the game. The game was made using Unreal Engine 4 and supports Nvidia's RTX technology. Publisher All In Games and 505 Games were set to release the game worldwide on October 27, 2020 for Microsoft Windows, Xbox One, PlayStation 4 and on November 10, 2020 for Nintendo Switch.