Big discounts on some books

Here we go, Amazon has gone crazy again with their promotions and I’m just passing on the information.

GIFTBOOK17 promo code for $5 off

First, of all, GIFTBOOK17 promo code which you apply on Amazon at checkout to get $5 OFF ANY BOOK is valid only for a few more hours, today November 26, 2017, until midnight, Pacific Time. Conditions apply.

Then, in addition to that promo code, Amazon have decided to give some really good discounts on the following books:

These discounts could change at any time – in fact some of them have changed while I was typing this message to you! It must be something about Amazon’s crazy algorithms for discounts, it certainly isn’t me who does that.

Posted in Kakuro, Killer Sudoku, Picross, Puzzle books, Samurai sudoku | Tagged , | Leave a comment

The Return of The Killer Sudoku

UPDATE: You can get $5 off any of my books on Amazon! Use promo code GIFTBOOK17 at checkout. Conditions apply! Valid until November 26.

Yeah, that title sounds scary, don’t you think? But before that… Happy Thanksgiving, folks, if you happen to give thanks today! 🙂

So… a first book in the new series of books with killer sudoku puzzles is now published. It is something in between the “Revenge of Killer Sudoku” and “The Deadliest Killer Sudoku” series, at least as far as the difficulty of the puzzles within goes.

There are NO EASY, NO COOL puzzles in this book! Difficulty levels are THINKER-BRAIN-IQ-INSANE. The breakout of puzzles is as follows:

  • 100 classic Killer Sudoku 9×9. Half of them are THINKER, 30% are BRAIN, 20% are IQ.
  • Another 10 classic 9×9 Killer Sudokus, all of them INSANE!
  • 10 ZERO Killer Sudoku
  • 10 Killer Sudoku with all four arithmetic operators +,-,*,/
  • and my new personal favorite… 20 Killer Sudokus 10×10, using all 10 digits from 0 to 9!

The book is waiting for you to order. And use that coupon! The price will go up a bit in the next couple of days!

Posted in Killer Sudoku, Puzzle books | Tagged | Leave a comment

Super Quad Sudoku Samurai

I’ve been quiet a little over the past week or so, but now you can expect an avalanche of announcements and newsletters.

First up: A new Samurai Sudoku book is out! It’s actually a SUPER Samurai book. This is a new series which will contain more puzzles than the previous Super Samurai Sudoku series of books. Why? Because the last 10 puzzles will be a variety of super samurai, including some LOCO Super Samurai Sudoku puzzles!

Anyhow… this book is available to order and ship immediately. Be quick, because in a couple of days the price might go up a little!

Posted in Newsletters, Puzzle books, Samurai sudoku, Washington Post | Tagged | 1 Response

4 books available for pre-order

Here is a novelty: 4 of my books are now available for PRE-ORDER.

Important: The price on these books is discounted by about $2 or so. When they get published, which is in about a week’s time, the price will go back to normal.

In order of their publishing dates, the books in question are:

  • Super Quad Sudoku Samurai will be published on November 21. It’s a new series of books with Super Samurai Sudoku puzzles and it contains 10 puzzles more than the previous series!
  • Coming up a day later, on November 22, is a book with 150 Killer Sudoku puzzles of medium and hard difficulties: THINKER-BRAIN-IQ-INSANE. It is a new series called “The Return of the Killer Sudoku“. There are a few killer sudoku variants in there. It is not meant to replace neither “the deadliest” series, nor “the revenge” series. It is something in between those two (but somewhat closer to the deadliest killer sudoku series).
  • Then, on November 23, a completely new book with 100 brand new Nonograms-Griddlers-Picross-Hanjie puzzles is released. All puzzles are new, previously unpublished (unlike in the 600 nonograms book).
  • And last, but certainly not the least is the book simply called “Puzzles by Dr Djape“. This book will be released on November 24, 2017 which marks the first anniversary from the date when I defended my PhD thesis. This book contains 100 sudoku variants and 17 other puzzle types, for a total of 300 puzzles altogether. It’s a very special book with very special puzzles. I hope it turns into a series!
Posted in Killer Sudoku, Picross, Puzzle books, Puzzle variants, Samurai sudoku, Sudoku Variants | Tagged , , | Leave a comment

Griddlers solving – advanced techniques (Bordering)

A while ago I posted an explanation of an advanced Griddlers/Picross/Nonograms/Hanjie solving technique called Bordering.

Here is another example of the bordering technique applied in a different way.

Consider this partial nonogram in which only the top few rows are shown. Focus on the first three rows and the “7” clues in them. Where can or cannot this “7” clue in the first row begin? Notice the circled “1” which belongs to column 5.

Can the “7” of the first row begin in column 1? It can’t. Why? Because if it did, the “2” in column 2 would also kick off the “7” in row 2, but the “1” in column 5 would stop it before all 7 squares in row 2 are filled, because after the “1” in column 5 there must be a blank square. Get it? Think about it for a while and consider what happens with the perpendicular lines when the “7” of the first row begins right at the start of the row.

Continuing this logic, we can conclude the same for the first four squares of row 1 and get to the following position (the red “X”s mean “certain whites”).

Now, let’s extend this logic to row 3. Look at all the circled “2”s, which are the first clues (this is extremely important) in their corresponding columns. Looking from the start of row 1, the first two circled “2”s prevent the “7” of row 1 starting anywhere before the “2”s, because the “3” nested between the two “2”s would extend to row 3, but it would be a lonely black square in row 3 because there would be a white to the left and to the right of it, because of the “2”s. Think about it for a while.

Finally, now start applying this logic looking from the end of row 1 backwards (right-to-left). The “2”s are circled and should help you conclude that none of the last 7 squares in row 1 can be black and therefore, must be white.

Does this make sense to you? Please do comment and/or ask questions if you have any doubts.

Posted in Picross, Solving tips | Leave a comment

1000 Kakuro puzzles in one book

Things are getting veeery busy… and then some!

Two announcements:

I sent out a newsletter yesterday in which I informed you that from now on, my books will be available for pre-order. More about that in a second, but first, let me tell you that another collection of 1000 Kakuro or Cross Sums or Number Cross or Crosswords with numbers puzzles has been published. This is volume 2 in the series and it actually contains more than volume 1. The number of puzzles hasn’t changed, it’s still 1000 Kakuros, but half of them have grown in size, so there is actually more to solve than in previous volume!

IMPORTANT: The book is right now discounted and it’s just $19.99 for 1000 Kakuro puzzles! For a very limited time you are getting a $5 discount, so now is the time to get it! First in best served, while the promotion lasts!!!

This book is already released and you can order it and it will be shipped immediately. However, future books will be available for pre-order and one of them actually already is available for pre-order!

It’s a new series with Super Samurai sudoku puzzles and once again, in this new series you get more puzzles for your $! Click on the image to find out more… This book will be fully released on November 21. Until then you can add it to your wish list or actually pre-order it and it will be shipped on November 21.

Posted in Kakuro, Puzzle books, Samurai sudoku | Tagged | Leave a comment

Killer Sudoku Samurai book

After 9 volumes of books under the title “Killer Samurai Sudoku”, I decided to start a new series with the same kind of puzzles and an almost identical name. This series will be called “Killer Sudoku Samurai”.

The difference is that this series WILL BE CHEAPER and it will contain fewer puzzles. 65 Killer samurai puzzles for $9.99 is a great deal!

The book is already available on Amazon and other online stores and you can access it by clicking on the image below.

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Posted in Killer Sudoku, Puzzle books, Samurai sudoku | Tagged , | 2 Responses
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