Friday 22 February 2013

Friday Puzzles #197

Odd Sudoku this week - that is only odd numbers can go in shaded cells.  I don't care what Fred says, I think this is pretty hard.  Constructing this was a lot like constructing a Sudoku Islands puzzles, and I imagine is how people go about trying to construct the monstrously difficult scanraid-busting classic puzzles.  Enjoy!

Week 6:
Saturday (V day, Bram)
Sunday (Counting on line, Seungjae)

Week 7:
Monday (Equal, Christoph Seeliger)
Tuesday (Between 1 and 9, Prasanna)
Wednesday (Fortress, Bastien)
Thursday (Little Killer, Rishi)

Oh, I should also mention that it's been a particular difficult week, so watch your step with these.  And if you haven't already joined the facebook group, then why not!?
    #234 Odd Sudoku – rated medium
All puzzles © Tom Collyer 2009-13.

Friday 15 February 2013

Friday Puzzles #196

More daily league.  I'll edit in further updates later, or something.  Enjoy!

Week 5:
Saturday (Battenburg, Bram)
Sunday (All Odd/Even-GT, Seungjae)

Week 6:
Monday (Blackout Sudokuro, Fred)
Tuesday (Untouch, Prasanna)
Wednesday (Odd-Toroidal, Bastien)
Thursday (Anti-Knight, Rishi)
    #233 Non-consecutive Sudoku – rated easy
All puzzles © Tom Collyer 2009-13.

Friday 8 February 2013

Friday Puzzles #195

More daily league.

Week 4
Saturday (Little Killer, Stefan Heine)
Sunday (Bridge, Seungjae)

Week 5
Monday (Thermo, Fred)
Tuesday (Rossini, Prasanna)
Wednesday (Classic, Bastien) - highly recommended!
Thursday - (Trio, Rishi)

And finally me.  Odd-Even-Big-Small Sudoku is a beautiful Japanese variant that has a lovely blend of hidden singles and pairs in its solving flavour.  Makes solving an 8x8 puzzle vaguely bearable.

Oh, and the rules.  Where you have a clue outside the grid, the first two cells in the corresponding direction must match the relevant description.  Odd = {1,3,5,7}, Even = {2,4,6,8}, Big = {5,6,7,8} and Small = {1,2,3,4}.  Enjoy!
    #232 Odd-Even-Big-Small Sudoku – rated medium
All puzzles © Tom Collyer 2009-13.

Friday 1 February 2013

Friday Puzzles #194

More Sudoku this week, but I suppose it's all good practice for me for 2014.  I suppose I am not being too much of a tease to suggest that if you'd like to see a few more puzzles without a Sudoku flavour in the coming weeks, then I can only suggest that you join the facebook group and offer to write puzzles for the Daily League instead of me.

Here are the updates, by the way.  Quite a few of the puzzles this week are very challenging, so consider yourself warned!

Week 3:

Week 4:
Monday (Extra Regions, Fred)
Tuesday (Anti-Diagonal Sums, Prasanna)
Wednesday (Pointing Evens, Bastien) - this is a delightfully simple-yet-subtle variant, by the way.
Thursday (Argyle, Rishi)

Anyhow, one of the few benefits of being ill and retired to bed by the early evening is that I have plenty of time to put together puzzles.  On the other hand, I'm not necessarily in such a great condition to solve or grade how difficult puzzles really are.  Still, this puzzles has plenty of the sort of logic that I would judge makes an analogous classic puzzle a hard puzzle, so I shall stick with my guns on this one.  Enjoy!
    #231 Diagonal Sudoku – rated medium
All puzzles © Tom Collyer 2009-13.

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