Paranautical Activity is a first-person shooter video game developed by American indie studio Code Avarice, and later by Digerati.

[3] The game's development was transferred to a new studio, Digerati, and re-released on Steam under a "Deluxe Atonement" version that included new content.

[8] Code Avarice would later run a successful Kickstarter campaign during August 2013 to complete the game, obtaining $12,000 of the $10,000 requested, and fund its publication on their own through Steam.

Though Maulbeck later said the message was not meant to be taken seriously, Valve pulled the game from the Steam store, saying that they had ceased discussions with Code Avarice as a result of the threat.

Digerati worked with Valve and Code Avarice to restore the game to Steam on February 12, 2015, under a new "Deluxe Atonement Edition", adding some new content alongside the re-release.