Detuned Broadcast #1: Masyu

Masyu by Tom Collyer


or solve online (using our beta test of Penpa-Edit tools in linex mode where left click+drag draws lines and right click marks X’s)

Theme: TC

Rules: Standard Masyu rules.

Answer String: Enter the length in cells of the horizontal loop segments from left to right in the marked rows, starting at the top. If the loop only has vertical segments in the marked row, enter 0. Separate each row’s entry with a comma.

Time Standards (highlight to view): Grandmaster = 1:00, Master = 1:30, Expert = 3:00

Editor’s Note: Today we add Tom Collyer to our list of Contributing Puzzlemasters. A noted sudoku solver and puzzle author, Tom’s Friday Puzzles have been an online puzzle mainstay for many years — not to be confused with Thomas‘s Friday Puzzle which started around the same time.

Solution: PDF

  • chaotic_iak says:


    Welcome Tom Collyer! Does this mean the old blog is now archived, like the previous two contributors?

    • Avatar photo Tom Collyer says:

      No, my blog will continue as per usual.

      Although on reflection, for most of 2013 there has very much been a sudoku flavour to my blog, so the occasional puzzle here will compliment things nicely!

  • Ravi says:

    ~ 2:00
    Excellent puzzle!
    Never expected that the opening would be my favorite puzzle 🙂


  • hagriddler says:

    Are there some deliberate traps in this puzzle ?
    Or am I just stupid for having to start over twice… 🙂

  • Giovanni P. says:

    You know, when I saw the Yajilin article yesterday, I couldn’t help but be reminded of Tom’s earlier puzzles involving that sort of presentation. I didn’t think he’d be a contributing puzzlemaker so soon afterwards! Welcome to the fold Tom!

  • edderiofer says:

    49 seconds, with use of uniqueness logic with the white pearl in R4C6. I agree; this was hard as I couldn’t find any other possible breakthrough. I’m sure, however, that the intended path (I spotted it AFTER the uniqueness logic) would have been to realize that gur oynpx crney arnerfg gur gbc yrsg pbeare pnaabg cbffvoyl tb yrsg, nf guvf jbhyq sbepr n pybfrq ybbc. Yes, this IS trickier than a normal Monday I suppose.

  • skynet says:


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