999: Nine Hours, Nine Persons, Nine Doors is a DS room escape/ visual novel game from Chunsoft. .The game has 9 people trapped on a boat for the Nonary game and they have to find a door marked with a 9 to which escape through within nine hours before the ship sinks. It is the first game in the Zero Escape series In 2012, it's sequel Zero Escape: Virtue's Last Reward was released for 3DS.
The player takes the role of Junpei in the first-person, as he and the rest of the 9 escape. The game has essentially two game modes that switch as the plot progresses. The first and most prominent is the Escape portions where the player looks around to find parts to which to progress through locked doors. Usually, there is some sort of puzzle as a part of the lock. Characters or records usually help bring the backstory of the game to light. There are 16 Escape sequences in the game though the player will not experience them all in a single playthrough.
The visual novel portions is where most of the main plot is given. The player reads the various characters' interactions as they progress through the ship. At various points, the player will be given choices which determine how the plot will develop. These choices determine which escape sequences the player will have and what ending the player gets. There are 6 endings in the game with 6th true ending locked unless the player completes a certain bad ending.