May 29, 2009

Friday Puzzles #2

Ok so this is getting a bit late now; on the other hand perhaps it’s not if you live in Hawaii. That’s the way it goes.

This week’s offerings are two Nikoli staples.

Masyu is a loop puzzle, where you try and join a loop in a grid containing white and black circles. The loop must pass through each of the circles; through a white circle the loop must go straight through, but then makes a 90 degree turn in one of the next squares. At a black circle, the loop makes a 90 degree turns, and then extends on in a straight line for at least two squares. See more here.

Nurikabe is an islands puzzle. You are given a grid of squares which must be coloured white or black. Each of the given numbers lies in an island comprised of the relevant number of white squares. Surrounding each island is a sea of black squares, subject to certain restrictions. Firstly the black squares are all connected, and secondly, given any 2×2 block of squares, at least one must be white. See more
here.

#003 Masyu – rated easy

#004 Nurikabe – rated hard

All puzzles © Tom Collyer 2009


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Welcome to the blog of current UKPA sudoku champion, two-time Times national sudoku champion and general logic puzzle fan Tom Collyer.



Home of the original Friday Puzzles, each Friday I publish a 100% original and handmade logic puzzle, inspired by the world-famous Nikoli company.


How to play:
AkariFillominoHashiHeyawakeHitoriKakuroLITSMasyuNumberlinkNurikabeRipple EffectShikakuSlitherlinkSudokuSuraromuYajilin.

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Latest comments

  • I like the appearance of the solution. :P Nice one. by Prasanna Seshadri on this entry
  • I think I've seen something vaguely similar in some of Palmer's puzzles as well. To be honest I've a… by on this entry
  • That's two puzzles in a row where I find something I had used before. I know, not plagiarism; just g… by Bram on this entry
  • Kota, that's not really true. I had made my puzzle before going to the WPC already. Also I don't hav… by Bram on this entry
  • About 20 minutes, after restarting from a mistaken conclusion. by Bryce Herdt on this entry

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