ZERO ESCAPE
Zero Escape: Nine Hours, Nine Persons, Nine Doors, also simply known as 999, is the first installment.
The Nintendo DS version, the first version of the game, was developed by Chunsoft and published in Japan by Spike on December 10, 2009, and in North America by Aksys Games on November 16, 2010.
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On May 29, 2013, the game was ported to iOS for iPhone and iPad and released in Japan. The port was named 9 Hours 9 People 9 Doors HD Smart Sound Novel, as it was released as part of the Smart Sound Novel series. The escape room puzzles were removed in favor of more focus on the visual novel aspects. The English version, titled Zero Escape: 9 Hours, 9 Persons, 9 Doors: The Novel, or simply 999: The Novel, was released on March 17, 2014 worldwide.
999 Cover
On March 24, 2017, Zero Escape: The Nonary Games, a bundle pack containing a remastered version of 999 with voice acting and a port of Virtue's Last Reward was released for the PlayStation Vita / PlayStation TV, PlayStation 4 and PC.