Friday, 26 December 2014

Friday Puzzles #261

Hurray!  It's another Christmas Tree Sudoku!

  • Givens take the shape of silly decorations.  There is nothing else to say about these.
  • The tree (anything shaded green or brown) acts as a fortress.  Which is to say numbers placed in the fortress must be strictly greater than those placed in the immediately adjacent  cells outside the fortress;
  • Silver circles (fairy lights?!  Tinsel!?!) marking some pairs of adjacent cells are as in Parity Sudoku.  Which is to say one of the numbers to be placed must be odd and the other must be even.  Not all such pairs are marked
  • White circles (erm, stars!?) marking some pairs of adjacent cells mean the corresponding two numbers to be placed must be consecutive.  Not all such pairs are marked.
Nice and easy.  Enjoy!

   #300 Christmas Tree Sudoku – rated hard

All puzzles © Tom Collyer 2009-14.

Friday, 12 December 2014

Friday Puzzles #260

Numbers placed in marked adjacent cells must be of opposite parity (i.e. one is odd, the other is even).  Please note that not all such cells are marked!

The trouble with if and only if conditions is that most of the fun is hidden behind the "only if" condition (think consecutive, XV, tens and so on).  These constraints still make for interesting puzzles simply as "if" constraints when designed properly.  They certainly look better.

Enjoy!
    #299 Parity Sudoku – rated medium
All puzzles © Tom Collyer 2009-14.

Friday, 5 December 2014

Friday Puzzles #259

Unfortunately I seem to be saving a lot of my better work for GM puzzles these days - and that doesn't just mean twisted symmetry either.  I'm not entirely how I feel about that, all things considered.  Enjoy!
    #298 Masyu – rated easy
All puzzles © Tom Collyer 2009-14.

Friday Puzzles #258

Bad news: I forgot to post last week.  Good news: I'll post twice this week!

Also, I managed to win* myself another nikoli time trial!  That brings me up to 5 (3 Sudoku wins, 1 Masyu win* and now 1 Shikaku win*).

(*) in this case, win means finish second to someone who'd won a time trial earlier in the year
    #297 Non-Consecutive Sudoku – rated medium
All puzzles © Tom Collyer 2009-14.

Friday, 21 November 2014

Friday Puzzles #257

Here's a puzzle called Shakashaka.  This one started off with good intentions and an interesting idea, but for now will make a good example as I am knackered.  Enjoy!
    #296 Shakashaka – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 14 November 2014

Friday Puzzles #256

It's been a long time since I rock and rolled...
    #295 Sudoku – rated easy

EDIT: as pointed out in the comments, it seems I forgot to post a puzzle I made at the end of August for the Daily League on the blog.  So here it is!
    #294 Blackout Sudoku – rated medium
All puzzles © Tom Collyer 2009-14.

Sunday, 9 November 2014

The Art of Puzzles: Masyu

So here's a trademark Masyu that appeared over at Grandmaster puzzles the other week!

Monday, 5 May 2014

detuned radio is off the air

As you may have guessed from a lack of posts recently, I've decided to mothball the blog until the WSC and WPC is all over and done with.  My focus is primarily writing sudoku, so there may be the occasional puzzle featured over at GM puzzles whenever I need a break.

See you all in the summer!

Friday, 11 April 2014

Friday Puzzles #255

More classic Sudoku, for all my dearest readers.  Enjoy
    #293 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 4 April 2014

Friday Puzzles #254

Classic Sudoku - nothing too hard, although not completely easy.  Enjoy!
    #292 Sudoku – rated easy

All puzzles © Tom Collyer 2009-14.

Thursday, 3 April 2014

The Art of Puzzles: Cave & Nurikabe

So I've had two of my wackier puzzles published as part of Oddity week over at GM puzzles.  Here's the Cave and here's the Nurikabe.  And yes, you do bloody well have to prove your solutions are unique!

Friday Puzzles #253

Only a mere 6 days late, here's an easy yajilin.  It has the sort of trick that I should probably send to 11 buried in there, but inevitably with a puzzle I penned before collapsing from exhaustion last night there seems to be too many clues.

I have to say I'm considering shutting down the blog until the autumn after tomorrow's post.  We shall see how things go, dearest reader.  Ditto with my contributions to GM puzzles.

For now, enjoy!
    #291 Yajilin – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 21 March 2014

Friday Puzzles #252

I have something of a plane to catch, so here's this week's puzzle without further comment.  Enjoy!
    #290 Odd-Even-Big-Small Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Thursday, 13 March 2014

Friday Puzzles #251

I quite like the linked rule to liven up 6x6 Sudoku - a number placed in a cell in the left grid must be different from the number placed in the corresponding cell in the right grid.  Enjoy!
    #289 Linked Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 7 March 2014

The Art of Puzzles: Masyu

I've had a rather lovely Masyu puzzle posted over at Grandmaster Puzzles earlier this week.  Even if I do say so myself!

Friday Puzzles #250

More diagonal sudoku this week.  Enjoy!
    #288 Diagonal Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 28 February 2014

Friday Puzzles #249

*collapses*

Enjoy!
    #287 Diagonal Sudoku – rated medium
All puzzles © Tom Collyer 2009-14.

Friday, 21 February 2014

Friday Puzzles #248

Well, I'm late, and pressed for time, but news is good and things will be getting more interesting from next week onwards.  There goes my free time!

I should also mention, in case you want to try your hand at a really evil Heyawake puzzle, that I have contributed to the recently commenced LMI Puzzle Marathon.  Good luck - you'll need it!

For this week in the here and now, enjoy another easy-ish classic!
    #286 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 14 February 2014

Friday Puzzles #247

No more classics next week, I think/hope.  It'd mean I'm less busy, which would also be nice. Enjoy!
    #245 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 7 February 2014

Friday Puzzles #246

Another Daily League classic this week.  At least I'm on time.  Enjoy!
    #284 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Thursday, 6 February 2014

The Art of Puzzles: Tapa

Here's a medium level Tapa for you to have a go at, over at Grandmaster Puzzles.

Friday Puzzles #245

Wow - almost a week late, and back to the bad old days of this blog's tardiness!  That said, I'm settling into a new job and a new house so perhaps you'll permit me a little bit of leeway, Dearest reader.

With a daily league sudoku coming up very soon, here's something you should all be comfortable with.  Enjoy!
    #283 Masyu – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 24 January 2014

Friday Puzzles #244

Another classic sudoku this week. Enjoy!
    #282 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 17 January 2014

The Art of Puzzles: TomTom

A puzzle of mine just went up over at Grandmaster Puzzles - something meaty to get your teeth into!

Friday Puzzles #243

The next few weeks might prove to be a little busy for me, so there might be a few more of these easy(ish) classics coming your way.  I like to think there aren't too many people who do this better than me, including all the other newspapers and websites you might play, but as ever I'll leave that judgement to you, Dearest Reader.  I hope I don't disappoint - enjoy!
    #281 Sudoku – rated easy
All puzzles © Tom Collyer 2009-14.

Friday, 10 January 2014

Friday Puzzles #242

Nothing too spectacular this week, Renban groups.  Numbers placed in the shaded cages must form a consecutive set and must not repeat.  Enjoy!
   #280 Renban Groups Sudoku – rated medium
All puzzles © Tom Collyer 2009-14.

Wednesday, 8 January 2014

detuned radio: an update!

So I'm just taking the time to do a little thinking aloud, and update my dearest readers on what they can expect from me as a puzzle maker in the coming year (and beyond!)

Firstly, my main priorities for the next few months lie with the UKPA, and with several major upcoming projects.  First on the list are the UK Sudoku Championships and UK puzzle Championships, as well as hopefully a bit of website work.

I remain committed to the daily league sudoku project, and this will mean that a good chunk of the puzzles on this blog will remain sudoku and variants.  There may be a few other types, but I wouldn't count on it for now.  I'd very much encourage anyone who thinks they might want to get involved, to get involved.  These are the best sudoku puzzles you find anywhere in the world, and they are coming out one a day.  It's something I am very proud of and I hope it'll keep going for as long as possible!

As time allows, I'd like to start organising contributions and putting together a book to sell. There are many things to sort out here, and this is something I certainly won't have any time for until much later this year at the earliest.  You'll have noticed that I've stopped putting together PDF's for the daily league - this job is currently being undertaken by Christof Seeliger, and you can find these files on the facebook group.

Perhaps some of my dearest readers have been a little disappointed that for the last year this blog has almost exclusively dealt in sudoku and variants.  However, I'm sure you are all more than aware that I am currently a "Contributing Puzzlemaster" over at the Art of Puzzles blog.  From now on I intend to put a post on this blog linking to the relevant post whenever one of my contributions appears.  Given my UKPA priorities, this will be sporadic for much of this year, but perhaps it'd be reasonable to expect something at least once every 2-3 weeks from me there.

Whilst talking about Grandmaster Puzzles, it'd be remiss of me not to mention their Patreon page.  The idea here is basically a way to voluntarily provide financial support for a project via a kickstarter-esque mechanism.

I am toying with the idea of setting up my own Patreon page, and I'd like to get some kind of feedback on whether this would piss anyone off.  Let me make this clear: detuned radio will remain free to view and free of any ads as long as I have a nice free platform like blogger that allows me to do so.  Creating puzzles remains a wonderful distraction which is reward enough without beginning to think about any kind of money.

I'm not sure I'd like to promise any Patreon rewards (solutions?  Nice PDF's?) for any theoretical patronage just yet, but it would be nice to give those of my dearest readers who might like to express their generosity the opportunity to discretely do so, without getting in the face of my equally dearest readers who don't.  I'll probably try and discuss this a little more in the next few weeks if I get some positive noises.

Finally, this puzzle needs a home - and given something very similar appeared on GM puzzles yesterday - I can't think of a better place than here as reward for putting up with my ramblings.  Perhaps this should have gone up on the 1st, but whatever.  Enjoy!
    #279 Yajilin – rated medium
All puzzles © Tom Collyer 2009-13.

Friday, 3 January 2014

Friday Puzzles #241

A happy new year to all my dearest readers.  Given that both 20 and 14 are even numbers, and 405 is not, there's a fairly obvious diminishing returns thing going on with the tweaking of the uncaged cells.  C'est la vie.  Enjoy!
    #278 Killer Sudoku – rated hard
All puzzles © Tom Collyer 2009-14.

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