Yes.
Some puzzles require interactions in or knowledge from other rooms first. Some require beating the game once (to get a new feature in New Game+ mode). Some require checking the Internet since there are no in-game clues.
Yes.
Some puzzles require interactions in or knowledge from other rooms first. Some require beating the game once (to get a new feature in New Game+ mode). Some require checking the Internet since there are no in-game clues.