Friday Puzzles #155

So I thought what I'd do for a while before sharing my puzzles this week is bore you a little with some copyright.  The puzzles on this blog are free for anyone to use and reproduce under the following conditions.  The first condition is that you do not use them for commercial purposes.  If you want to make my money from my puzzles then it is unacceptable that you do so without a (large) cut coming my way.  The second is that I am fully attributed, so that my work is fairly recognised as belonging to me.  This should at the very least feature my name and a link to this blog.  Should you wish to use my puzzles under any other terms, then you should get in touch and we can talk.

This is as stuffy as I am going to get with my puzzles.  I maintain this blog for the benefit of the community.  I would like the community to grow and expand, and if my puzzles can be used as part of this, then this makes me very happy indeed.  Although it would be nice, should you wish to use my puzzles elsewhere, to ask me first, I do not deem this to be necessary.  As long as you aren't being overtly offensive or abusive when using my work I will in fact be glad of the good advert whether I am conscious of this advert or not.

I wish more people shared my attitude.  With the advent of the internet, I believe a revolution in copyright is coming.

Anyhow, this week I have two Sudoku variants that I put together for the Polish national championships, which recently happened.  Two puzzles which I'd have been more than happy to have been published elsewhere, under the conditions outlined above, so that the wider community could enjoy them.  Turns out they are here first instead.  Enjoy!

    #186 Arrow Sudoku – rated hard
BROKEN - SEE THIS POST.

    #187 Irregular Sudoku – rated hard

All puzzles © Tom Collyer 2009-12.

Friday Puzzles #154

So I've apparently lost my faith in all of humanity, and most of my all my own self-esteem.  I wanted to spend ages knocking up a really nice yajilin puzzle, and instead this one simply fell out in 15 minutes. Enjoy.

    #185 Yajilin – rated medium

All puzzles © Tom Collyer 2009-12.

Friday Puzzles #153

Every now and again I worry that I might be using up all the possibilities for Masyu with twisted symmetry, but there always seems to be one more.  Not the most aesthetically pleasing, or indeed challenging puzzle, but one has to keep one's hand in.  Enjoy!

    #184 Masyu – rated easy

All puzzles © Tom Collyer 2009-12.

Friday Puzzles #152

More twodoku this week.  This one is probably undercooked in terms of difficulty - I'm fairly sure I can take out a couple of givens, but it will have to do.  There's certainly a little more interest provided with the irregular grid.  Enjoy!

    #183 Twodoku – rated medium

All puzzles © Tom Collyer 2009-12.

Friday Puzzles #151

Delayed, I'm afraid, until Sunday.  I was toying with the idea of putting out something old, or perhaps something that may or may not end up being used for the UKPA Open - but I think the safest bet is to simply wait until I can actually put out something new.  Sorry!

EDIT: better late than never.  Here's a Nurikabe which will hopefully have a couple of head scratching moments.  Enjoy!

    #182 Nurikabe – rated easy

All puzzles © Tom Collyer 2009-12.