Outside-2 Sudoku: Must be placed in one of the first two cells in the corresponding direction. Outside clues per variant show:ĭifference Sudoku: The difference of the first two digits in the corresponding direction. Normal 6圆 sudoku rules apply to all sudokus, so each row, column and region must contain 1-6. A circle is an outside clue for both adjacent puzzles. This is one large puzzle, consisting of six different variants of 6圆 sudokus, all linked together by circles. May not work on non sudoku grids or special constraints. One of the guys that actually solved the puzzle said it took him over 5 hours to complete.Hotkeys Selection Select cells + Mouse click/drag Add or remove from current selection Move selection +, + Add to current selection + Select all cells + + Deselect all cells + Invert selection, Tool sensitive selection Number Entry Insert value, pencil mark, candidate or colour Insert value, pencil mark, candidate or colour Button Insert value, pencil mark, candidate or colour Change Tool, Next mode +, Previous mode "Digit" mode ( on German keyboard layout) "Corner" mode "Centre" mode "Colour" mode + Enter digit in "centre" mode + Enter digit in "corner" mode + + Enter digit in "colour" mode Undo / Redo + Undo last action + Redo last action if it was undo Check finished puzzle Button Press the check button to test basic sudoku rules. I only got serious last summer though.įor reference, a different thread that got traction here recently, had a puzzle rated 7.3 SE "Nightmare". Anybody doing those without guessing can do the NY Times or Times (London) weekly hardest puzzles. In any event, 3.5 is pretty hard for casual players. Many apps on phones port over either Sudoku Explainer's algorithm, or Hodoku's algorithm to analyze puzzles. With all other steps being trivial for both the human and Sudoku Explainer. But if you analyze the starting position, SE might list a single harder step you didn't need, like a Sashimi Swordfish, but not a single finned X-wing. So it's only good for a general idea of how difficult a problem is, or to find a hint when your stuck.įor a hypothetical example: You could solve a problem with multiple finned X-wings as the hardest steps. Humans use whatever technique they find as they go along. For example: Some people are fine with forcing chains, and some don't like them.Īlgorithms solve by using the easiest steps available, and the fewest harder steps needed. I'm not saying those techniques are better or faster, but rather a personal choice. Then there's the fact humans can use techniques that would never be programed in an algorithm. Also, phone apps in particular usually don't program every technique available to the desktop version, so for really difficult problems, they just end up using more and more forcing chains. It's not perfect, like any other rating algorithm. It's rating is based on the hardest technique in the puzzle it can find. A Windows 10 app that solves and rates puzzles. Only the important information is in the grid that you specifically saw and wanted to remember. This style of note taking allows you to still find important pairs/triples as well as pointing pairs, and they end up really standing out because you haven't put notes in every single cell. Corner notes are when a value is limited to certain cells within a box. Center notes are for when a cell is limited to a small number of values. The general idea is that you have two kinds of notes: center notes and corner notes. You can also do things like coloring, where you don't know what value a cell is, but you do know that certain cells will have the same or different values from each other.Įveryone has their owns strategy for note taking that makes sense for themselves, but if you're looking for something sensible, I'd recommend looking into Snyder Notation as used by Cracking the Cryptic on YouTube. 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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