Moirai was a 2013 video game created by independent developers Chris Johnson, Brad Barrett and John Oestmann.

The lead developer, Chris Johnson, was a lecturer at the School of Computer Science at the University of Adelaide and a programmer in the visual effects industry, who had worked on prior projects including the puzzle game Expand.

[2] Chris Johnson stated that Moirai was conceived an experimental title,[5] inspired by his experience watching an interactive play A Game of You by Belgian theatre performance group Ontroerend Goed.

[7] Other influences included the films of Alfred Hitchcock, whose narratives frequently involve "characters in scenes where they look guilty, and look like they're going to be framed", and the social deduction video games SpyParty and Hidden In Plain Sight.

[10] Following its Steam release, Moirai received unexpected attention, with Chris Johnson saying that "the response from players completely exceeded our expectations".

[2] This behavior increased when Moirai launched on Steam in 2016, with Johnson struggling to manage the high demand of the game's servers and monitoring the database of player responses, which were emailed to him directly.

[13] Johnson stated "I was surprised by (the surplus of toxic entries)...I think I was a little bit naive...Some of that comes because it's a free game and a lot of people who played it are kids.

"[4] In 2017, the Moirai server was subject to repeated attacks, including a script that flooded the game's database of player responses, requiring the developers to take down the system.

[13] Although the exploits were possible to fix, because the developers lacked the time, money and resources to address the many issues with the game,[4] an announcement was made on June 29, 2017 that Moirai would no longer be available on Steam and its servers would be discontinued.

[1] Critics praised Moirai for its unique premise and gameplay, with many writers reflecting upon the moral implications presented by the player decisions and interactions in the game.

[15] Shaun Prescott of PC Gamer praised how the game tested players' ability to react to a moral dilemma, particularly exploring "how you comport yourself when you think no-one's listening".

[4] Writing for Rock Paper Shotgun, Porpentine Heartscape disagreed with the premise that Moirai was about a moral dilemma, stating the game explored the flaws of judgment and justice in creating varied outcomes based upon how well the player is able to advocate for themselves.