This can be as simple as noting that a certain cell has very few possible candidates, or that within a box there are only 2-3 cells that can have a candidate. Good notes are when you've discovered something interesting about the grid and want to remember it for later. And then, when you place digits in the grid, it auto-cleans the notes, so you have to keep re-going over your notes to see how they've changed. Apps that do this for you are a terrible crutch, in my opinion, because they remove the important aspect of note taking - specifically, that they help you remember what you've already discovered about the puzzle, and help you focus on what effect newly discovered information has on what you've already discovered.Īuto notes remove both of those things - they aren't things you've discovered, and instead is just more information flooding the grid that means nothing to you until you examine it. As others have said, you're going to have a very difficult time with hard Sudokus without some use of notes, however it's very rarely optimal to just notate the entire grid.
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