Nine people have been kidnapped by a mysterious man called Zero and forced to participate in a survival game known as the “Nonary Game”. Each one has a bracelet numbered 1–9, which they must use to pass through doors numbered 1–9, to reach the exit before 9 hours run out and the ship in which they are sinks. Various puzzles must be solved in order to advance through the ship and reach the exit, while uncovering the mysteries behind the Nonary Game.
999: Nine Hours, Nine Persons, Nine Doors

Tags:
Amnesia
Blind Hero
descriptions of violence
fear of death
Flashback
Kidnapping
male protagonist
Murder Mystery
Mystery
Osananajimi Heroine
proactive protagonist
Reunion
Ship
Suspense
trapped
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20 comments
But then again, I see lots of similiar game here, in erogedownload.com
As for why 999 is here. Probably because it's by the same author of Ever 17 amongst several other VN's.