"Hacknet" was developed by Matt Trobbiani, the sole developer of Team Fractal Alligator, based in Australia. "Hacknet" received generally positive reviews from critics. GameSpot gave the game an 8/10, praising the game for its unique presentation puzzle design. A DLC expansion for "Hacknet", titled "Hacknet Labyrinths" was announced on August 30 2016. The expansion was set to come out December 2016, however, development issues delayed release to March 31, 2017. The expansion features new hacking tools and security systems, as well as a 3- to 4-hour chapter to the game, where the player is recruited by a hacker that goes by the alias "Kaguya" into a small elite hacking team. It includes more secrets, more UI themes and a full new soundtrack, from artists such as synthwave artist OGRE and Rémi Gallego, creator of metal/electronic act "The Algorithm". In May 2017, official mod support for "Hacknet" titled "Hacknet Extensions" was released worldwide, in which players can create their own custom stories and campaigns for the game. These extensions can be shared and downloaded from the Steam Workshop. Extensions are separate from the main game, and are accessed from a separate menu from the title screen. "Hacknet Extensions" also features extension-exclusive tools and the ability to implement custom music and themes.