![]() ![]() Now here’s the beauty of how an iterative macro works: As long as the puzzle data continues to be passed to the bottom Macro Output tool (which is called an “iteration output”), the macro will keep running. I would like to sort the solved Sudoku puzzles by their relative difficulty level and save a CSV file that contains the solved puzzle data. This section includes Join, Filter, and Union tools – which each play their part in confirming that the solutions generated by the algorithm are correct. I cross-reference the solutions against a list of known solutions that have been published online. Once the macro has generated solutions for all 1,000 puzzles, I want to ensure that these solutions are correct. I will dive deeper into this section in a few moments. This macro is where I keep the “secret sauce” – the algorithm that actually solves Sudoku puzzles. The “macro” is actually an entire workflow hidden inside one tool. This includes an Input tool that reads a CSV file containing 1,000 randomly selected Sudoku puzzles and a Select tool that allows me to clean my data before using it in the rest of the workflow. ![]() This workflow has four main parts, each consisting of multiple tools: A software tool that I enjoy using – Alteryx – is really useful for automating “analytic processes” such as this.īut wait! How can a Sudoku puzzle be solved with an “ analytic process ”? So, I decided to make a robot that can follow the same thought process that I was using but hopefully solve the puzzles a lot faster and without manual effort. My brain was having fun, but my writing hand was getting sore. This tedious manual effort can cause an infraction to Rule 3: “Have fun!”Īfter playing Sudoku many times myself, I realized that I was using the same patterns, again and again, to find the solutions to these puzzles. Sometimes, these strategies can be very repetitive and require a lot of manual effort to execute (the game is typically played on paper with a pencil). While the game itself can be challenging and complex, several strategies can be used successfully to find the solution. For very hard puzzles, that number can be much higher. It is believed that the average Sudoku player spends approximately 20 minutes solving a typical Sudoku puzzle. To print multiple puzzles, there are special pages to print two, four, or six puzzles per page.It seems simple, right? Wrong! It can be incredibly challenging to solve a Sudoku puzzle. Guessing is never required - but it may help! Each puzzle has a unique solution and can be solved with pure logic. The position is saved as 81 digits at the end of the URL string, with hyphens used for empty cells.Įxtreme Sudoku posts five new puzzles every day. To save any position, right-click on under the grid, and click Add To Favorites or Bookmark This Link. You can add symbols too, such as question marks. If you prefer to enter your own pencilmarks, up to six digits can be entered in each cell. These update by themselves as you solve particular cells and cannot be edited manually. There are automatic pencilmarks that appear if you check the Pencilmarks box. So it's possible to have incorrect digits that don't conflict, but eventually you will get stuck. The Show Conflicts button does not apply the solving logic - just checks whether there are any conflicting digits already in the grid. To print the puzzles use either the Print button below the grid, or if you want to print the pencilmarks as well, use the browser Print option under the File menu. See our guide to solution rules for hard sudoku puzzles.Īll the puzzles on this site rate a "fiendish" category, but then we picked the hardest, and graded them in five progressively more difficult categories: Evil, Excessive, Egregious, Excruciating, and Extreme, in order from least difficult to most difficult. ![]() Difficulty depends on the type of steps required to solve them, and also on the number of each type of step. Solving these puzzles is a different matter entirely, since these are the most difficult puzzles we create. Each row, column, and 3 x 3 box must contain only one of each of the 9 digits. Just place the digits from 1 to 9 in each empty cell. Then try some of our very hard sudoku puzzles. ![]()
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