Nine Hours, Nine Persons, Nine Doors is a visual novel for the Nintendo DS developed by Chunsoft and published by Aksys Games in North America in 2010. It features Junpei, who finds himself trapped aboard a sinking ship, and, along with 8 other people, needs to find a door with a 9 on it.

yep2yel solves the many puzzles of the various escape rooms and gets all endings in record time.

We very strongly recommend that you play the game first before watching the TAS, as it'll inevitably spoil the story and the solutions.