### Dr. Sudoku Prescribes #149 – Cave

PDF

Theme: Grouped Clues

Rules: Standard Cave rules.

Answer String: Enter the length in cells of each of the cave segments from left to right for the marked rows, starting at the top. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 3:00, Master = 4:15, Expert = 8:30

• Tricia says:

I wonder if anyone will try to solve it as a Fillomino…

• Before I saw this comment, as a goof I actually did try to solve it as a Fillomino (almost certainly solvable but non-unique), then edit it into a working Fillomino (no luck, but I’ve never constructed one before).

• James says:

I heard about Grandmaster Puzzles this weekend. I’m no where near expert level (though thanks to the anti-checkerboard tip, I did solve this one in twice expert time). Just want to say I appreciate this site.

Do people like to fill the cave or fill the walls when doing Cave puzzles?

• Rob says:

Personally, I mark inside and outside the cave (filling both with different colours in software, similar to what the doctor does (http://www.grandmasterpuzzles.com/images/11/corral-2007.jpg) on paper).

• Jack Bross says:

If I shade, I tend to shade the outside (walls). On the other hand, I’ve also started thinking them as loop puzzles more than I used to (which is how the genre started). That means sometimes I don’t really shade at all, though putting little dots in “confirmed interior” and X’s through “confirmed exterior” cells is still often handy.

• Aaron Chan says:

I use the same notation as the good doctor, except I use X’s to cross out numbers. I used loop edges in the past, but I find the shading method more useful in deducing logic.

• Carl says:

I agree that this puzzle is usually most suitable for shading, unlike most other loop puzzles. I’d be curious though to hear about see some puzzles which force you do do both – these are one example: http://thegriddle.net/ppp/.

• Jack Bross says:

I do both shading and loop-drawing for some Slitherlink variants, like sheep and wolves, or the “Outside Knapp Deneben Slitherlink” that went up on Croco this weekend.