Anonymous;Code

The game takes place in the year 2037, one year after the disastrous "Sad Morning" event which occurred on February 6, 2036. Due to date overflow errors caused by the Year 2036 Problem, a network of orbital laser satellites called SA4D (Strategic Attack For Defense) went out of control and attacked the capital cities of numerous countries around the world, causing significant chaos, destruction and death. Tokyo in particular suffered greatly, with the numerous satellite laser hits creating "Craters" all over the city. As a result, there are concerns that a similar disaster, the Year 2038 Problem, will occur.

Meanwhile, technology has progressed significantly, with wearable computers called BMIs allowing people to seamlessly connect to the internet. Quantum computing has also become commonplace, with international laws put in place to prevent the creation of Earth Simulators. However, that does not stop groups from researching them in secret. One such simulator is developed by child prodigy Asuma Soga at the Gai Institution, dubbed GAIA. GAIA can not only reconstruct or simulate events that happened in the past or present, but can also predict future events, allowing whoever controls it to influence the future.

Anonymous;Code was developed by Chiyomaru Studio and Mages and was written by Naotaka Hayashi, Ayano Suehiro, and Tsukasa Tsuchiya. Alongside Occultic;Nine, it was initially announced as part of the Science Visual Novel series, intended to be separate from the developers' Science Adventure series. However, both games were later incorporated into the Science Adventure series, with Occultic;Nine and Anonymous;Code serving as the fifth and sixth main entries in the franchise respectively. In contrast with the concept of infinitely expanding horizontal "world lines" used in Chiyomaru Shikura's Science Adventure game Steins;Gate, Anonymous;Code uses the concept of infinitely expanding vertical "world layers", with the main character being able to manipulate layers below his, and is themed around hacking. According to Shikura, the game's role is in part resolving unanswered questions from the Science Adventure series.

Shikura stated that he initially wanted to increase the game's immersion by applying a unique artwork to every scene and using full animation during major events. However, he realised the game would need at least 3000 pieces of artwork (in contrast to the usual 100 found in visual novels), not counting the costs to produce the animations, and thus discarded this idea. His research on how to lower the costs of an immersive visual novel led him to consider reusing old animation, developing Steins;Gate Elite from this idea.

George Yang of RPG Site noted that Anonymous;Code grabbed his attention in a way that he hasn't seen since Steins;Gate. Matthew Sainsbury of Digitally Downloaded called Anonymous;Code a perfect, thought provoking, intelligent “page turner” to end the series on, praising the thematic depth of the narrative, while Wes Playfair of NookGaming was positive about the game overall, but stated that it lacks the depth and maturity of earlier Science Adventure games. Oliver Shellding of WayTooManyGames was critical of the saving and loading mechanic, but lauded the game overall, noting: "If a visual novel can cause you to question existence, it's doing something right."