Free printable easy sudoku sheets2/7/2024 ![]() ![]() ![]() Private Sub Form_Load ( ) Dim idx As Long Having said all of that, I still wish you good luck with your project, We immediately know that that fourth corner is a 7, or the puzzle would have more than one solution. And let's say the fourth corner can only accept 3, 7, or 9. Furthermore, let's assume that three of the four corner cells will only accept two possible numbers (let's say 3 or 9). Let's say you've identified a rectangle (four cells on the corners of a rectangle, spanning across either two or four 3x3 areas). ![]() I've seen very difficult Sudoku puzzles with lots of starting numbers (and vice-versa).Īnd, before I close, let me outline one of the trivial strategies I often use when working these things that depends on their being precisely one-and-only-one solution. Therefore, beyond figuring out whether your initial conditions meet the three criteria, you've still got work to do to guarantee that you've constructed a proper starting Sudoku puzzle.Īnd just to add in another point, the number of starting numbers is related to the difficulty, but it's not precisely predictive of it. There is more than one solution with all numbers filled in that meets the above criteria.Īnd, just to be clear, an initial set of "good" numbers can wind up failing either of those unworkable conditions (but, obviously, not both).Īnd, just to make another point, many of the strategies for solving Sudoku puzzles depend on their being precisely one and only one solution to the puzzle.There is no solution with all numbers filled in that meets the above criteria.In fact, there's two ways that a puzzle can be unworkable: Even when your initial random numbers meet these criteria, you can still (in fact, rather easily) come up with unworkable puzzles. you are still not guaranteed a workable puzzle. Furthermore, even if your initial random numbers meet the following criteria. Just generating a few random numbers between 1 and 9 on your Sudoku grid do not guarantee a workable puzzle. ![]()
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