This is a Nurikabe puzzle.
Puzzle 333
(Click for larger size)
This appeared in a round of 20 by 20 puzzles of standard types. I don’t think this round ever got put online due to an error in another puzzle, but based on the points distribution published online, where it had the second highest worth behind only a similarly sized Kakuro, this was probably one of the harder challenges in the round.
Melon's Puzzles 
June 22, 2011 at 9:46 pm |
This was a really enjoyable puzzle. Thanks a lot for this. I like what you did in the bottom right.
On an unrelated note, did mathgrant’s blog just disappear?
June 23, 2011 at 2:53 pm |
Nice puzzle indeed. Not too much counting, and heavily dictated by global constraints. What’s not to like.
Thanks.
TheSubro
June 23, 2011 at 5:29 pm |
Was the use of the 20 and 11’s (as in 2011) deliberate? That’s cute. Fairly amusing puzzle, actually.
June 23, 2011 at 11:29 pm |
I guess yes, the clues form I P C and the extra clues are 20 11