October 17, 2009

Friday Puzzles #19

The eagle eyed amongst you might have noticed I deleted yesterday’s entry and replaced it with this.

Less waffle, more puzzles to actually do! The idea this week is you have a standard sudoku puzzle to do – and rather than using the toroidal identifications, instead you are using those of the Klein bottle. Rather than try and laboriously try and rigorously explain the rules with respect to quotient spaces, topology, covering spaces, orientability and lots of other maths – what I’ve done instead is labelled the grid and coloured everything in so the rules are all completely obvious.

Who[*] says the internet is shortening attention spans and generally making everyone more stupid anyway?

#023 Klein-bottle Sudoku – rated medium

All puzzles © Tom Collyer 2009

[*] Ah wait, that’d be me. Expect less mercy next week.


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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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