Friday, 8 March 2013

Friday Puzzles #199

This week we have a puzzle whose better known cousin involves the number 5.  I've no idea where the name comes from, I'm not sure I like it, but basically this is killer sudoku where the cages aren't labelled.  All you know is that the units digit is 8 - so to be completely clear the only possible values are 8, 18, 28 or 38.

Still, I'm not one to turn down a request, and this should hopefully prove to be a good warm up.  As with many of the slightly more obscure sudoku variants, a lot of the difficulty comes from the novelty, so beginners might find this a little harder than medium as they get to grip with logic the constraint adds.  Enjoy!

Week 8:
Saturday (Quad Second, Bram)
Sunday (Magic Summer, Seungjae)

Week 9:
Monday (Arrow, Fred)
Tuesday (Search 9, Prasanna)
Wednesday (Renban, Bastien)
Thursday (Odd-Even Chessdoku, Rishi)
    #236 A Date with 8 – rated medium
All puzzles © Tom Collyer 2009-13.


  1. You could have named it 'A Date with 8' :-)

  2. The original name comes from the sci-fi movie "Short Circuit". It involves a robot, which may seem symmetric at first but is not.


  3. I assumed 5 is still alive was named so purely as a rhyme, that's why I suggested the name.


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