We are discussing a puzzle games. Part of that will be discussing puzzles. Maybe don't read comment threads talking about things you don't want any more information about.
There's a ton of ways to discuss The Witness without spoiling the game. The entire point of the game is to solve the puzzles, spoiling the puzzles is incredibly counterproductive. What's more, if you're actually genuinely stuck and want someone to give you hints, Hacker News is not the appropriate venue for that.