Nine Hours, Nine Persons, Nine Doors

• There are multiple endings. After finishing the game for the first time, you can replay it and optionally skip all the dialog from previous playthroughs.

• In the puzzles, sometimes you have to click multiple times on the same object/surface to get different or definitive answers.

• The way you interact with another person to show him an object is to go to the room he/she is, open the item view and click the "Search" button. The other character will tell you his/her opinion about the object.

• You can save the game at any moment, even in the middle of a dialog.

• It's not really a puzzle game, it's a visual novel. The puzzles these games have are relatively easy & serve more as a "break" in the story than as the core of the game.

• In the "flow" menu (down arrow on keyboard, check your button layout) you can skip to the chapter, puzzle or decision you want to replay / change without going through the whole story.

• The flow menu will highlight the "current" path the game considers you're on with a blue line, including past choices.

• If you're attempting to finish the game without a guide & see all the endings, the flow menu has some key & lock icons that are colour-coded to give you hints on where the choices /events / actions / puzzles of interest are.