Observer (stylised as >observer_) is a psychological horror video game developed by Bloober Team and published by Aspyr. It was released for Microsoft Windows, PlayStation 4 and Xbox One in August 2017, followed by versions for Linux, macOS and Nintendo Switch. An upgraded and expanded version called Observer: System Redux was released in November 2020 for Windows, Xbox Series X/S and PlayStation 5. Observer follows Daniel Lazarski, a detective known as an Observer, who can hack people's minds as a method of interrogation.
A team of around thirty developed the game using the Unreal Engine 4. It stars Rutger Hauer, who was also in Blade Runner, one of the primary influences. Arkadiusz Reikowski composed the score, infusing it with choral, diegetic and ambient music. Observer received generally favourable reviews. Critics praised the world design, visual effects and hacking sequences but criticised the stealth and its focus on style over substance.