Nine Hours, Nine Persons, Nine Doors

• If you want to remain unspoiled, DO NOT LOOK UP ANYTHING RELATED TO THE GAME, no matter how harmless it may sound. No art, no music, nothing. This may sound obvious, but bears mentioning because of how easy it is to spoil crucial plot elements.

• 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.