### Slitherlink (Sudoku) by Carl Worth

PDF

or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between edgex mode where left click+drag draws lines and right click marks X’s and a number entry mode.)

Theme: Clue Symmetry and Logic (inspired by an earlier contest submission from Scott Handelman)

Author/Opus: This is the 9th puzzle from guest contributor Carl Worth.

Rules: Standard Slitherlink rules. Also, enter a number from 0 to 3 into each gray cell as additional Slitherlink clues. Numbers in the gray cells cannot repeat in any row, column, or 2×2 group of gray cells.

Answer String: Enter the length in cells of each of the internal loop segments following the arrows for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 4:00, Master = 6:30, Expert = 13:00

Solution: PDF

• Aaron Chan says:

This was surprisingly hard.

• skynet says:

25:45.Had to guess through this one.

• Jack Bross says:

Very cool puzzle. It took me longer than it should to find the break-in for the “sudoku” cells, and even after they quickly filled in it was a somewhat tricky puzzle to close out.

• Carl W says:

As to difficulty, the real challenge in constructing this one was making it anything but trivial. A 2×2 sudoku can’t help but fall fast once you get a few digits in. Then, you get a lot of extra information for the Slitherlink from the 16 resulting digits.

So I was pushing for some tricks to remain in both parts. I’m pleased to see that that seems to have worked.

• Neelix says:

Like Jack, it took me longer than it should have to find the break-in for the “sudoku” cells, But once I did the rest fell into place for me fairly quickly.

-Neelix

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