Puzzle 268 (Nurikabe)

This is a Nurikabe puzzle.

Puzzle 268

Puzzle 268

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13 Responses to “Puzzle 268 (Nurikabe)”

  1. mathgrant Says:

    That was a clever little puzzle with some cool tricks. It definitely felt like you made it. 🙂

  2. Scott Handelman Says:


  3. Jonah Says:

    Really neat. The central trick of this puzzle is not one I’ve seen before, I think.

    • Jonah Says:

      Outside of Heyawake, I mean.

      • MellowMelon Says:

        I was originally thinking about asking which trick you were referring to, since I can think of three things this puzzle does that might be considered a bit out of the ordinary. None of them apply to Heyawake though, so now I’m really curious.

      • Jonah Says:

        Well, in Heyawake you often have two black components which you know are connected in one of two ways (but you don’t know which way yet), and that forces a white cell somewhere else to keep the whitespace in one piece. Same happens here, along the diagonals. (But with “black” and “white” switched, of course.)

      • MellowMelon Says:

        Ah, I see. What confused me is that I usually associate that concept with most all of those “black square” types: Heyawake, Hitori (or Out of Sight), and Yajisan Kazusan all can make good use of it. Yes, this puzzle certainly involves that idea, although my solution path only used it a couple of times.

  4. Marcin Says:


  5. Tom.C Says:

    Never mind heyawake, that had my favourite nurikabe trick as borrowed from numberlink. Very good!

  6. TheSubro Says:

    Thanks. I do not like my comments to usually contain spoilers, but the break in the middle diagonal was brilliant and fun. If I had just come across the puzzle in a Nikoli book or online without importance I would have probably assumed the creator errantly forgot stuff.

    Well done young man!

  7. rob Says:

    After these comments that I don’t fully understand, I’m wondering if we’re all using the same solution path?

    Here’s mine (spoiler):

    1. The bottom 8 must touch the border.
    2. Figure out what the diagonals imply, i.e., that they’re “connected”, and that the different diagonals must not touch.
    3. Deduce that the 3 in the second-from-last row must not go up (conflict with the two nearby 4s).

    After this, the puzzle fell easily for me. Step 3 is one that may require a little more thinking ahead than the creator usually intends, so I’m wondering if I was off the path?

    Thanks for a great puzzle.

    • MellowMelon Says:

      Step 3 is intended, albeit in chunks. Those two 4s have so little space that they can only be resolved in two (similar) ways, and you can draw a pretty diamond shape of black cells around them when you realize that.

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