Nine Hours, Nine Persons, Nine Doors (2009)

The game is a murder mystery visual novel with a heavy story focus that requires multiple playthroughs to figure out and involves puzzle rooms used to progress through the story with dialogue choices to be made inbetween them.

Storyline

"From somewhere far away, Junpei could hear the sound of metal squeaking. He felt his stomach tighten. There were a thousand things the sound could have been, but none of the things he could think of were good. In an attempt to distract himself, Junpei looked around the room once more. Set in the wall directly in front of him was a slightly dirty iron door. The first thing Junpei noticed about the door was the number roughly emblazoned across it. On the surface of the door, in red paint, someone had written... 5"