7
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enter image description here

Nurikabe (taken from Nikoli)

  • Fill in the cells with black under the following rules.
  • You cannot fill in cells containing numbers.
  • A number tells the number of continuous (adjacently) white cells. Each area of white cells contains exactly one number in it and they are separated by black cells.
  • The black cells are linked to be a continuous (adjacently) wall.
  • Black cells cannot be linked to be 2x2 square or larger.
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7
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This seems to be a correct solution:

enter image description here
I'm not sure whether it makes sense to talk to the logic in great detail - I started from the bottom left corner (only one of the 4 cells in the corner can be white, and it has to be white to adhere to the "no 2x2 black blocks" rule), and then just went from there.

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  • $\begingroup$ This is correct, well done! :D --- (oot: btw I'm a fan of your Codeforces' April Fools Contests~ XD) $\endgroup$ – athin Sep 6 at 3:25
  • 1
    $\begingroup$ @athin It's a small world :-) $\endgroup$ – Mariia Mykhailova Sep 6 at 4:30

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