Event 0

Event[0] is set in an alternate timeline where humanity achieved interplanetary space travel as early as the 1980s. The game takes place in this timeline's 2012, where the player's character is selected by International Transport Spacelines (ITS) to be part of a mission to Jupiter's moon Europa from Earth. En route, the ship suffers a catastrophic failure, and the player-character appears to be the only member of its crew to escape into a lifepod. The pod drifts for several weeks until it comes across the Nautilus, a leisure ship built in the 1980s.

The player character docks with the ship and discovers that while the Nautilus is still functional, it has fallen into disrepair, with no sign of its human crew. The only conversations on the ship are through the ship's artificial intelligence (AI) named Kaizen-85 (from the Japanese word kaizen meaning "continuous improvement"), who communicates with the player-character through keyboard terminals throughout the ship. Kaizen-85 instructs the player-character to destroy the Nautilus's "Singularity Drive", the engine that powers the ship, as it claims this will enable it to return them both back to Earth. However, as the player explores the station more, they discover that many of the doors and systems have been locked down, apparently by the now missing previous human crew, and they must work with Kaizen-85 to access these systems.

Event[0] began as part of a graduate student project at the National School of Video Game and Interactive Media in France (Enjmin) in 2013. The students later formed Ocelot Society in order to continue development into a commercial project. The team that worked on Event[0] is composed of eleven people. In 2014, the game received the student award at the European Indie Game Days as well as the Innovation award at BIG 2015. Event[0] received funding from France's CNC as well as from the Indie Fund.

The game, as released, had three expected endings, with Ocelot Society having dropped a possible fourth ending prior to release. However, around July 2017, Emmanuel Corno, one of the developers and writers at Ocelot, noted that the Wikipedia page for the game described a different fourth ending to the game (the last one listed above), which he affirmed was possible to obtain in the released game and was not the same as the dropped ending. Corno attributed this unexpected ending to be the result of a bug the team had not caught at this point, but was pleased that it existed as the emergent gameplay made the artificial intelligence they created feel "more human".

Event[0] received "generally favorable" reviews from critics, according to the review aggregation website Metacritic. Fellow review aggregator OpenCritic assessed that the game received fair approval, being recommended by 38% of critics. Reviewers have compared Event[0] to games such as the solitary narrative of Firewatch as well as the King's Quest series. The environment has been compared to the spaceship in Ridley Scott's Alien.

Several reviewers have also noted the similarities between Event[0]'s Kaizen AI and HAL 9000 from Stanley Kubrick's film 2001: A Space Odyssey. A common complaint, even in otherwise positive reviews, is the game's very short play time: as little as 3 hours for the first playthrough and an hour for subsequent playthroughs for the other endings. Event[0] was nominated for the Seumas McNally Grand Prize and for the Excellence in Design and Excellence in Narrative awards for the 2017 Independent Games Festival.