All 134 entries tagged Friday Puzzles

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December 02, 2011

Friday Puzzles #133

So I’ve had a rather whirlwind week this week, including a trip down to BBC Television centre in London to offer my services as a sudoku “expert” (haha), as well as focussing some of my puzzling energies on a hopefully forthcoming UKPA project. Part of this is involving writing some easier style puzzles of more familiar type to try and encourage participation amongst those slightly more casual solvers.

Whilst I think it’s fantastic that some of the world’s best solvers maintain blogs with their own fiendish puzzling creations, I think sometimes its easy to overlook the beauty and elegance and simplicity of a really well made “easy” puzzle – and in particular the appeal these sorts of puzzles have for those who aren’t quite at the level of the MellowMelon’s of this world. The idea is that you don’t want things to be patronisingly easy, but you do want any sticking points to be resolved by the more casual solver after perhaps a few moments of careful thought. And of course you want a really pleasing design.

Something along the lines, hopefully, of this week’s puzzle. Enjoy!

#163 Slitherlink – rated easy

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All puzzles © Tom Collyer 2009-11


November 25, 2011

Friday Puzzles #132

So in a previous WPC report entry, I mentioned I’d share what I thought was the pick of the puzzles. Well this is a sort of a pre-emptive strike on that front, because the puzzle I have in mind as the inspiration for this week’s puzzle is an absolute beast of a yajilin. However, rather than being a puzzle during one of the rounds, this was featured on a Japanese newsletter that was being handed round, courtesy of PuzzleTokyo, a society ran by students at the University of Tokyo (こんにちは – here’s hoping google translate isn’t screwing me over!).

What you need to know about this newsletter is that it was entitled “Habanero,” and what you need to know about this puzzle is that in the hotel in Eger I saw puzzlers as good as Byron C and Palmer M sitting and staring at it for quite a long while. And also that I feel happy enough about eventually (no doubt to the amusement of Aga B!) solving it to post a picture of my solution:

It should also be easy enough to recreate the grid if you want to have a go at it yourself. In case I haven’t been clear, be warned. This solves with some absolutely beautiful logic from start to finish, but, easy it certainly ain’t.

On a slightly parallel thread, a couple of days I commented on Para’s blog that he’d hit the jackpot with yajilin presentation. Trust me to go and find an example which then exploits a potential ambiguity in what I thought was so great. As such I’ve made some slight modifications which I don;t think look so bad given the visual theme of the puzzle. Notice that without the arrows in the blank cells, it is ambiguous as to whether R1C1 is a blank clue or simply part of the grid! In a slightly similar vein, the blank clues at R1C7 and R7C1 might just as easily be interpreted – for solving purposes anyway – as cells in the grid to be trivially shaded in. What will we do with yajilin presentations, dearest reader?

Enjoy!

#162 Yajilin – rated medium

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All puzzles © Tom Collyer 2009-11


November 18, 2011

Friday Puzzles #131

Some more book-keeping dearest reader, before we begin. Last week’s broken slitherlink will soon be fixed; indeed last week’s unfinished WPC reports will soon be completed. Oh – and there are a few more pages that I’ll be adding to the links section on the right, which I haven’t updated in quite some time.

I’m feeling a little bit drained and tired and ill this week, a combination of factors ranging from Eger withdrawal to bluffing my way through the proof of the wonderfully titled “tube penetration lemma.” Perhaps not one to google, that.

Anyway, this week a Nurikabe. I’ll be honest and say whilst I tested on paper, I didn’t do it on the png (which I never used to do, but actually catches more errors than you’d think it would). On the other hand there’s plenty of bite to the puzzle, and there’s even something of a theme going on. As well as my word that this isn’t in fact broken, touch wood. Enjoy!

#161 Nurikabe – rated hard

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All puzzles © Tom Collyer 2009-11


November 11, 2011

Friday Puzzles #130

And so, dearest reader, it matters not that that I’ve been away all week at both a world sudoku championship and a world puzzle championship performing quite well in the former and somewhat forgettably in the latter. Here is a Friday puzzle which is (just about) on time!

Yup, no puzzling updates, because frankly at this stage I’m not sure I want to write about how pear-shaped things have turned and I am sure that you probably don’t want to hear about my moanings just quite yet, so here is a slitherlink, plain and simple. Conceived on a long and boring coach trip, no less. Enjoy!

EDITED EDIT: this one works!

#160 Slitherlink – rated hard

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All puzzles © Tom Collyer 2009-11


November 04, 2011

Friday Puzzles #129

So this is my last entry before I jet off to Hungary to have a shot at firstly the World Sudoku Championship, and then the World Puzzle Championship next week. I’ll be travelling with laptop and notebook so there might even be a puzzle next week. I invite you, dearest of readers, to be on the lookout for updates here throughout the week.

For those that are interested, the instruction booklets for each competition are filled with some intriguing ideas.

http://users.atw.hu/rejtveny/wscwpc/puzzles/IB/WSC_inst.pdf
http://users.atw.hu/rejtveny/wscwpc/puzzles/IB/WPC_inst.pdf

This week’s puzzle has been taken from the WSC booklet. The only previous examples of these that I’ve seen have been no larger than 7×7 grids, but I’ve whacked this up to full size. The rules are as follows: 1-9 exactly once in each row, column and marked region. Some squares are split in half; exactly one half is to be filled, the other to be left empty. You have to determine which. I’m not totally convinced this is genuinely a hard, but I’ll give it that label anyway what with the novelty value. Enjoy!

#159 Halved Squares Sudoku – rated hard

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All puzzles © Tom Collyer 2009-11


October 28, 2011

Friday Puzzles #128

I’m running about as low on inspiration for a spiel this week as my laptop is its battery charge. Here’s a Nurikabe puzzle. It feels a little contrived but perhaps I’m just a little tired. Enjoy.

#158 Nurikabe – rated medium

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All puzzles © Tom Collyer 2009-11


October 21, 2011

Friday Puzzles #127

So another Masyu again this week. I had wanted to send one of the tricks from last week to 11, but then all of a sudden it was 11pm last night and I wanted to sleep. I guess I’ll just wait until I’ve got a nice long stretch of time to myself, perhaps on a train or a plane or something. Anyway, more twisted symmetry. You’d almost think they were easy to put together! Enjoy.

#157 Masyu – rated easy

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All puzzles © Tom Collyer 2009-11


October 14, 2011

Friday Puzzles #126

Wow – an entry on time – what is the world coming to!?

Well somethings never change. It’d have been really great to have pulled off this masyu with perfect symmetry, but as it is I’ve had to add an extra pearl to take the solution count down from 2 to 1. Can’t have it all eh? Still, I think there’s more than enough here to keep you entertained, and you might even need to use a slight twist on an old masyu chestnut to get you going. Enjoy!

#156 Masyu – rated medium

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All puzzles © Tom Collyer 2009-11


October 07, 2011

Friday Puzzles #125

I’ve been at a wedding and will busy until at least Sunday. I’m afraid it’s more delays. In other news, I’m considering a career managing the the West Coast mainline.

EDIT

OK, here we go. Tom Collyer writes another easy sudoku. But not trivially so. Enjoy!

#155 Sudoku – rated easy

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All puzzles © Tom Collyer 2009-11


September 30, 2011

Friday Puzzles #124

I’m afraid this week’s puzzle is also going to be a bit delayed, new laptop and all, perhaps until later tomorrow. Whatever happened to my time management!?

EDIT

After much delay, here is the puzzle. It’s another Nurikabe, a type for which I don’t think I’ve quite nailed my own individual style. On the other hand it means that I come up with lots of slightly quirky puzzles. But then I don’t know exactly how I should be rating them. I think for the sake of beginners I’ll leave this as a medium. Enjoy!

#154 Nurikabe – rated medium

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All puzzles © Tom Collyer 2009-11


Information

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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