**IMPORTANT**: The book is right now

**discounted**and it’s just

**$21.99 for 1000 puzzles**! For a very limited time you are getting a

**$3 discount**, so now is the time to get it! First in best served, while the promotion lasts!!!

A new collection of 1000 irregular, squiggly, twisted, jigsaw sudoku puzzles has been released. This is volume 2 in the series.
**IMPORTANT**: The book is right now **discounted** and it’s just **$21.99 for 1000 puzzles**! For a very limited time you are getting a **$3 discount**, so now is the time to get it! First in best served, while the promotion lasts!!!

Posted in Jigsaw Sudoku, Puzzle books
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Here we go folks! You can expect a ton of posts in the next couple of weeks with announcements for new puzzle books I’ve released.
First up, something that I hinted in my previous post: The Massive Book of Picross Hanjie Griddlers Nonograms with more than 600 picture puzzles has been published!
This is the book with the largest number of griddlers out there. Be warned: all puzzles in this book have previously been published in the first 6 volumes of my hanjie-picross series of books.
The price may seem high, but this is really **a great value for your money**! For under $40 you get 6 volumes worth of puzzles, which would cost you over $80! So you are getting the same number of puzzles for less than **half the money**!
The puzzles have been overhauled and slightly modified in appearance. The fonts are bigger and the lines are thinner so that the available space on a page would be used better.
If you like picture puzzles, this book is an absolute must!
And here is something I can already reveal: in a couple of weeks a new volume with ALL NEW HANJIE puzzles will be released. Stay tuned for updates (best is to sign up for the newsletter).

Posted in Picross, Puzzle books
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It’s strange that I have never posted any solving techniques for Picross-Hanjie-Griddlers-Nonograms puzzles. I’ve explained some of them in my picross books, but never here on the website.
So, that’s about to change and I’m immediately starting with an advanced solving technique, which I call “**bordering**“.
Consider this example (it’s a part of a griddlers puzzle that I’m working on right now).
Focus on the two bottom rows and on the corresponding clues. I claim that the cell marked with a red question mark cannot be black, it must remain white. Why? If it were black, the “5” clue, whichever of the two fives it might be, would stretch from this black either to the left or to the right, or a little bit to the left and a bit to the right. Now, see the clues on the top of the image. The clues highlighted in red are all greater than 1 and they are all last clues for the column they apply to. This means that the last patch of blacks in the corresponding columns consist of at least two black cells. In other words, if these patches of blacsk started in the bottom row, they would extend at least to the penultimate row of the puzzle. Get it? Now, if “?” were black, there would be a patch of 5 black cells which would all extend upwards for 2 or more cells, because of the clues on the top. This means that in the penultimate row there would be a patch of 5 cells, too, which must not happen, because the largest clue in the penultimate row is 2! Therefore, the “?” must be white! Get it?
But that’s not all! See if you can figure out how many other cells in the bottom row also can’t be black. I will reveal the answer at the bottom of this post.
Before that, let me tell you that I’ve published a new book with nonograms puzzles. There are 600 of them in this book! It’s the largest picross book out there. But more about that in a couple of days.
Ok, now, are you ready to see the answer? None of the cells marked with a red X cannot be black, they must be white!
The rule for the “bordering” hanjie solving technique can be generalized as follows (are you ready?):
If the smallest clue (we’ll call it X) in the bottom row is greater than the largest clue (we’ll call it Y) in the row above it, and if there is a string of at least 2*Y+1 adjacent columns in which the last clue is greater than 1, than the cell in the bottom row which belongs to the column in the middle of the string of Y columns cannot be black, it must be white!
Why this term 2*Y+1? Because the “X” clue could come either from the left or from the right, so you need at least twice as many clues plus 1 to get more than Y black adjacent cells in the penultimate row.
In my example, X=5, Y=2, and just by chance 2*Y+1=5 (but it doesn’t have to be the same as X). What’s important is that X>Y and that there are at least 2*Y+1 adjacent columns with bottom clues bigger than 1. In my example, there are actually 15 such adjacent columns, but be careful, you cannot put a certain “white” in all of them, only in the middle 15-2*Y. 🙂 Also, this partial puzzle shows that you can apply the same rule twice to the bottom row. There is another string, this time with precisely 5 adjacent columns and now you can mark only one cell as a certain white (5-2*Y). That’s the last red X in the image above.
Due to symmetry, the same principle applies to top rows and of course to first and last columns.
Study this example and think about it. It should all make sense. Let me know what you think!

Posted in General, Picross, Solving tips
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Here is a new puzzle I think you’ll like. It’s another LOCO Sudoku puzzle, however, it is not in Samurai format, but for the first time, it is in Clueless Sudoku format instead.
Before you try solving this puzzle, please become familiar with the Clueless Sudoku puzzles and with the Loco Sudoku puzzles, too.
Just to help you out with the instructions for this particular puzzle. There are 9 puzzles which all seem to be separate from the rest, each on its own. However, there is a trick! There is also a 10th puzzle which comprises of the 9 central nonets (3×3 boxes) from each of the 9 puzzles. The 10th puzzle is a plain old classic 9×9 Sudoku (aka “vanilla sudoku”). The name “clueless” comes from the fact that the 10th puzzle starts completely clueless (i.e. empty), because all 9 central nonets start without any clues! Get it?
Now… since this is a LOCO sudoku variant, I must tell you what the 9 constituent puzzles are:
#### Clueless LOCO Sudoku puzzle (Multi Sudoku 9+1 in 1)

### To access this puzzle click here.

PDF Version of this puzzle: Clueless LOCO Sudoku puzzle in PDF.

- TOP LEFT: jigsaw sudoku
- TOP CENTER : NON-CONSECUTIVE sudoku (it looks like vanilla but it is not!!!)
- TOP RIGHT: jigsaw combination sudoku
- MIDDLE LEFT: hyper sudoku
- CENTER PUZZLE: diagonal sudoku
- MIDDLE RIGHT: inequality sudoku (greater-less than)
- BOTTOM LEFT: consecutive sudoku
- BOTTOM CENTER : partial odd-even sudoku (shaded=odd, square=even, blank=unknown!)
- and BOTTOM RIGHT: KILLER sudoku!

Posted in Free sample puzzles, Jigsaw Sudoku, Killer Sudoku, Sudoku Variants
Tagged killer, samurai, variant
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First book of the season Fall 2017 has been published! In fact, it’s been available for pre-order for about 6 months, but as of yesterday, it is available for immediate shipment (while stocks last, of course).
The book is called “**Cuckoo Sudoku**” and no, it’s not my puppy on the cover. It contains only LOCO SUDOKU variants puzzles and what’s important to know is that this book is **SPIRAL BOUND**! And it costs just $8.95!!! GO GET IT NOW!

Here we go… this post is as personal as they get. There is a **home video** of me in it. And my puppy. And an Instagram post. And a **free puzzle**. I think I got your attention. Good.
If you are wondering why this personal post all of a sudden, you haven’t subscribed to my newsletter yet. Changes are coming to this site. Slowly. So stay tuned and subscribe. It’s free.
So I got a Border Collie puppy. Name is Cash. In Serbian language it is pronounced a bit more sharply than in English, you will soon hear me say it a few times. Why Cash? Because “Tango & Cash”. And I dance Tango, a lot.
Cash has been with me for 3 weeks now; however, I went sailing for a week and my Mom came over to take care of him. A couple of days after I got him I started clicker training him. I am amazed by his intelligence! Border Collies really are the smartest dog breed around. The video you are about to see was shot a day before Cash’s 3-month birthday. Unfortunately, I give him commands in my language, so you gotta trust me that he does what I tell him to do. If I ever post another video I will try to sound over my comments in English. Anyway… here is the video of me and Cash clicker training at my home.
I also posted a short clip of Cash on my Instagram. It was taken 2 days after I got him, before we started training.
Now, **BACK TO PUZZZZZZLES**!
I’ve been making Odd Even Sudoku puzzles for years, but this one I’m posting now is a bit different. It contains only PARTIAL Odd Even information. So, not all cells are marked as odd or even as before. Instead, only some of them are labeled. **Shaded cells must be Odd. Cells with a square must be Even.** No shade, no square? Could be either odd or even!
And of course it is not a vanilla Sudoku. It is Partial Odd Even Samurai Sudoku and it’s supposed to be a bit difficult. Here we go:
#### Partial Odd Even Samurai Sudoku – Overlapping Sudoku Samurai variant – Gattai 5

Click on the puzzle thumbnail to access the puzzle.

PDF Version of this puzzle: Partial Odd Even Samurai Sudoku puzzle in PDF.

PDF Version of this puzzle: Partial Odd Even Samurai Sudoku puzzle in PDF.

Hey, it’s been a while since my last post… September is the month which marks an anniversary of this website, so I’m gonna start posting more often and possibly, on some non-puzzle related topics. Not sure yet, but it might happen. Stay tuned.
Anyhow… Unless I’m mistaken, I haven’t posted a puzzle of this type before. It’s a gattai 8 overlapping sudoku, just like sudoku harakiri, but in a different arrangement of puzzles. Those who like Super Samurai Sudoku or Harakiri Sudoku (by the way, the Harakiri book is currently discounted by $2!!!) will surely like this one.
Here it is… it’s labeled IQ for difficulty, but it’s not really all that hard. Oh, I nearly forgot: it requires a heavy use of the Twin Nonets solving technique.
#### Sudoku Cross – Overlapping Sudoku variant – Gattai 8

### To access this puzzle click here.

PDF Version of this puzzle: Sudoku Cross Gattai 8 variant sudoku puzzle in PDF.

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