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I'm 99% sure this was an invalid Sudoku puzzle. Just before putting the 2 in here (above the pencil 6), I put in 6 and it said Mistake, so I erased it and put
by neogodless 4mo ago
I'm 99% sure this was an invalid Sudoku puzzle.
Just before putting the 2 in here (above the pencil 6), I put in 6 and it said Mistake, so I erased it and put 2. But... why wouldn't 6 be valid there?
https://imgur.com/a/aOnKbiT https://imgur.com/a/aOnKbiT
EDIT: As per replies, "X" Sudoku is variant with a different rule. While I saw the diagonals "highlighted" in another color, I didn't know that rule. Perhaps it could be added to the page for those unfamiliar with this non-standard Sudoku variant?
- EdSchouten 4mo agoYeah, that Sudoku puzzle has multiple valid solutions, whereas the page only seems to accept a single one.
- rmunn 4mo agoThere's an extra constraint on that one: the two main diagonals must both have nine different digits. That's what makes it a single-solution puzzle.
- doodpants 4mo agoBecause there's already another 6 on the same main diagonal. This is an "X Sudoku" puzzle, which means that each main diagonal must have all 9 different numbers.
- neogodless 4mo agoAll I've never done the diagonals before... oops. https://imgur.com/a/Dfxf9CJ https://imgur.com/a/Dfxf9CJ (before picking 2 / 6 / 7.)
- shagie 4mo agohttps://www.sudokuwiki.org/sudokux.aspx https://www.sudokuwiki.org/sudokux.aspx is a useful site. I'm personally a fan of the killer variety. Its solver is interesting in showing the individual steps. For the same puzzle, https://www.sudokuwiki.org/sudokux.aspx?bd=060390008049001503003000901304800105010400006600000080800900050530260809000078302 https://www.sudokuwiki.org/sudokux.aspx?bd=06039000804900150...
- zem 4mo agoif you like sudoku, you owe it to yourself to check out the "cracking the cryptic" youtube channel and get introduced to the delightful world of variant sudoku.