Friday Puzzles #110

So details of my LMI July Puzzle test, another Nikoli slection, will be released imminently.

Also of note to puzzle fans throughout the land is news of the official UK Puzzle Championship, following on from the Sudoku Championship I happened to win the other week. The drill is much the same, you need to be registered at the UKPA forums, and you should probably take a look at firstly the instruction booklet and the discussion thread if you intend on competing. As before you can participate during any 2 and a half hour window over the weekend.

This week’s puzzle is Heyawake. It’s largely easy, but with a couple of twists thrown in for good measure. Enjoy!

    #138 Heyawake – rated medium
 

All puzzles © Tom Collyer 2009-11

Friday Puzzles #109

So apparently my brain is rather frazzled today, and whilst there is the makings of a good puzzle idea here, this one is probably a little too symmetric and a little too easy. Also, in other news, I didn’t make any mistakes :D.

    #137 Yajilin – rated easy
 

All puzzles © Tom Collyer 2009-11

Friday Puzzles #108

So in the midst of my triple posting last week, I managed to put out a completely broken Sudoku puzzle, where I’d presumably mistyped one of the digits. Looking back a bit later, I realised it was broken but couldn’t find the dodgy digit, so I went back and changed it.

Anyway, more Sudoku today. This weekend is the UKPA’s Sudoku championship – and I have taken the liberty to put together an example of one of the featured Sudoku variants.

Incidentally, if you want to participate, UK citizen or otherwise, then you should definitely read the instruction booklet and the discussion thread. To actually take part in the test, you will have to be a registered member of the the UKPA forums. Registration is free and easy!

Anyhow, back to the variant. This one has the rather inelegant name of “No Donkey Step Sudoku” – perhaps when I have a free moment (haha) I’ll try and think of something better. Anyhow, the idea is fairly simple. Classic Sudoku rules as you know and love them, with the additional constraint that digits may not repeat within 2 cells on a diagonal line at 45 degrees. If you are familiar with no-touch sudoku, then this is simply a slight extension of the constraint. If you still don’t get it, have a look at my good friend Rishi Puri’s example, which has the advantage of coming with a solution grid. Enjoy!

    #136 No Donkey Step Sudoku – rated medium 
 

All puzzles © Tom Collyer 2009-11

Friday Puzzles #107

And so we’re back up to date with this entry. Unfortunately I’m running very low on inspiration for blurb text, I’ll let this Slitherlink puzzle speak for itself. Enjoy!

    #134 Slitherlink – rated easy
 

Ah what the hell, seeing as I’ve got this lying around anyway, and this is apparently the only thing I do on my blog, why not another twisted-symmetry Masyu? You’ll note I’m sure, that this (along with the vast majority of my other recent Masyu offerings) indeed has the full twisted symmetry. Enjoy!

    #135 Masyu – rated easy
 

All puzzles © Tom Collyer 2009-11

Friday Puzzles #106

So this is the post to make up for an absence of anything last Friday. This might have been the Great Wall sudoku that I came up with on the coach to and from – you guessed it – the Great Wall, but it turns out that was broken and I want to give that a little more time to fix it to do things justice.

Instead, you’ll have to make do with one of my trademark slightly quirky Nurikabe puzzles. It’s generally plain sailing, but watch out for the odd moment. Enjoy!

    #133 Nurikabe – rated easy
 

All puzzles © Tom Collyer 2009-11