### Dr. Sudoku Prescribes #23 – Cave

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Theme: An Almost Perfect 10? The border of this Cave puzzle is almost completely uniform.

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 Standard: Cave Master = 3:30, Expert = 10:30, Novice = 33:00

• hagriddler says:

I understood quickly the general idea of this puzzle, but made an error along the way so my unused cells couldn’t escape.
But I really like this one, how dó you come up with so many nice puzzles in such a short time ?

• TheSubro says:

Nice Corral/Cave/Bag puzzle.

It was your first this week that emphasized the necessary “path to the sea” constraint. Was hoping for a super hard one from you, but was satisfied with this one – that took around 7-8 minutes. My favorites are your more advanced Inside/Outside Corrals, or multiplicative ones. Ahh, a boy can dream.

Thanks for a fun week of these though.

TheSubro

• drsudoku says:

Inside/Outside is a little crazy, but I do agree that Multiplicative is close enough to the Classic form that it should be a regular option with this genre of puzzles. I just can’t start with knob #2, invented by Grant, without writing the original style.

Re: super hard versus this – I write certain kinds of themes and see where they end up. Sometimes it is just a particularly elegant but medium difficulty week. This week’s Cave ended up there certainly, as did the Nurikabe.

• I’ve settled into a nice little routine of doing these as a set on Saturday. It helps me know the types I’m good at to do a bunch of puzzles of them together. This week went ok, I overshot the mark on this Corral with near 4 minutes to solve, but got into the expert time on the other two. The arrows all went really well. I liked this one in particular as I like the ones where the outer region is in action as much as the inner region.

• skynet says:

I just now completed this cave…can there be a cave cell which is not part of any number?because i have submitted the solution and as i was seeing again i saw that there is once cell which cannot be a non – cave segment because then it would be in the middle and that cell is not part of any number too…R2C7

• drsudoku says:

Yes, the cave cells do not all need to be seen by a number. However, needing a single unique solution, there will only rarely be such cells in any cave.

• ksun48 says:

Nice little puzzle, with good use of connectivity (took me about 6-7 minutes)