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# Weekly Challenges

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## Challenge #200: Sudoku Solver

8 - Asteroid

Beginner and Intermediate solutions attached. Will have a look at advanced next but it looks really tough!

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14 - Magnetar

And that makes 200!  Beginner, Intermediate, and Advanced solutions.  I think I channeled @patrick_digan on this one.  Could have made the standard macro iterative to reduce number of tools, but runs fast and works as is.  I still prefer the "brain and pencil" method, but nice to be able to create a workflow of how my brain solves Sudoku puzzles.

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Iterative Macro

Std Macro

Workflow

7 - Meteor
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Beginner and Intermediate done. I'll post the solutions for advanced when I have more time later.

12 - Quasar

I had fun solving the intermediate. I did have to talk myself into using strings instead of math! I will attempt the advanced later for practice writing iterative macros. - terry10

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13 - Pulsar

Here is solution for intermediate leave.

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8 - Asteroid

Solved Beginner level!

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7 - Meteor

Here's my attempt at Beginner and Intermediate

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15 - Aurora

Beginner wasn't really a challenge and intermediate/advanced are basically the same when you try a general approach.

I solved it with a iterative macro and the approach to check rows/columns/tiles. No Python, No R involved.

8 - Asteroid

Here is my beginner solution... will need to work on more of it to get to intermediate and advances

11 - Bolide

I stuck with the Beginner solution which I solved by using the RegEx tool twice (attached workflow)

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If I wished to completely solve the Sudoku, I would study the solution created by my colleague Fred Koenders. He described it in a blog some time ago (link in Dutch: https://infotopics.nl/blog/2018/07/20/sudoku-solver-met-alteryx/)

Best,

Roland

Infotopics - Benelux partner of the year
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