November 05, 2010

Friday Puzzles #77

Greetings all – just a quick update this week. The first two puzzles are taken directly from the instructions of the imminent UKPA Sudoku Championship. Please note that the second link takes you to a groovy new tournament page.

#098 Irregular Sudoku – rated easy

#099 Touchy Sudoku – rated medium

Please refer to the puzzle examples section of the instructions linked above to refer to the rules. I can’t really be bothered to copy and paste them here! You’ll also have the novelty of finding the solutions there too!

For my 100th published puzzle, I’ve decided to let myself go a bit. Yup, another twisted symmetry 10×10 masyu – but I reckon this one is probably harder than last week’s offering. Rest assured that I’m going to stick to my guns on this and still call it a medium – just! I am particular pleased that almost by accident I stumbled upon a way of implementing the sort of non-trivial global logic I’ve wanted to put into a puzzle of this size for a long while now. The finishing move is pretty subtle as well, but no less cool for being so. Enjoy!

#100 Masyu – rated medium

All puzzles © Tom Collyer 2009-10


- 3 comments by 0 or more people Not publicly viewable

  1. Deb Mohanty

    Again a very well crafted Masyu. Definitely trickier that last week’s.
    Accidentally or otherwise, it is not easy to craft it with a so small grid and with all the aesthetic constraints you have for all your Masyus.

    06 Nov 2010, 04:37

  2. The Subro

    Very nice thoughtful (or thought-filled) Masyu. Enjoyed pumping it out. Mohanty is right.

    Thanks.

    06 Nov 2010, 12:49

  3. Marcel Kincaid

    Nice, thanks. I just discovered Masyu yesterday. I note that a hint is available from the uniqueness requirement in the UL corner.

    31 Dec 2010, 07:29


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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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  • 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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