DJ Ape .Net - The Home of Perfect Sudoku » hidoku

A new Hidoku puzzle

djape — Mon, 12 Apr 2010 07:25:45 +0000

Since I stopped with the

Daily Hidoku

puzzles, I never really posted one puzzle of this species for you. Sorry about that, here it is now!

By the way, the two Hidoku books I published should be solved in reverse order. Why? Because the puzzles in Volume 1 are slightly more difficult than the puzzles in Volume 2!

The rules of Hidoku can be found here.

10×10 Hidoku for Monday, April 12, 2010.

The solution is here

Hitori, Killer Sudoku Compendium, Sudoku Straights and Hidoku 2 on Amazon.com

djape — Tue, 14 Jul 2009 07:39:36 +0000

Finally, my latest four books are available on Amazon.com:

Hidoku – The Next Puzzle Craze: 200 puzzles (vol. 2)

djape — Thu, 18 Jun 2009 08:23:55 +0000

I promised that Hidoku puzzles will be back in one form or another… and here they are!

When I published Volume 1 of this book I did say that I was a little worried that I’d overdone the difficulty of the puzzles. And rightly so. Your comments did say that some puzzles were too challenging. Therefore, this time I have reduced the difficulty of the puzzles, but only by a notch. So, if you are new to Hidoku, I recommend trying volume 2 before volume 1!

(click on the cover page to go to lulu and buy!)

US $5.95 or Â£4.24 or â‚¬4.61 (PDF e-book)

(payable by PayPal or credit card)

Enjoy!

Daily Hidoku

djape — Sat, 17 Jan 2009 09:57:45 +0000

As you all may have noticed, I’ve finally started posting Hidoku puzzles on a daily basis!

They can be found every day, Monday to Friday, on the Hidoku page!

Happy New Year!

djape — Mon, 29 Dec 2008 12:36:48 +0000

I hope you all had a nice Christmas and that you are enduring the cold weather well. Well, those in the Northern hemisphere anyway.

Let me tell you about the changes that I plan for 2009:

There will be more Jigsaw Sudoku puzzles on the Daily Sudoku page. They will be accompanied by the Sudoku Straights puzzles, which is something new, but I think you should learn. There will be fewer (non)consecutive puzzles – it seems they’ve gone out of fashion.

The “Download” page with Perfect Sudoku v0.4 is gone. That software is more than 3 years old and is way outdated. For the time being, I do not intend to release a newer version.

There will be a new page with daily puzzles! In fact, as of tomorrow, you will be able to download Daily Hidoku puzzles from this site! For those unfamiliar with Hidoku, check this category.

I intend to start creating more puzzle types: Hitori and Nurikabe are next in the queue! Stay tuned for updates.

I intend to publish a number of new books as well as new volumes of the old ones. Very soon a Picross (Hanjie, Griddlers, Nonograms) book is coming, followed by new volumes of the “Revenge”, Samurai, Hidoku and KenDoku. I’ll keep you posted.

That’s it for now. Have a great New Year’s Eve! Best wishes!

UPDATE: Sorry folks, for various reasons, I will start posting the daily Hidoku puzzles from around the 15th of January.

“Hidoku: The Next Puzzle Craze” and “Square Wisdom – Calcudoku” books available on Amazon

djape — Sun, 16 Nov 2008 16:52:28 +0000

The two recently published books are now also available on Amazon:

Hidoku – The Next Puzzle Craze: 150 puzzles

Square Wisdom: 200 Calcudoku puzzles

Again, I would GREATLY appreciate if you rate and/or review my books that you purchase on Amazon, no matter if your review is positive or negative. It means a lot.

Hidoku – The Next Puzzle Craze: 150 puzzles

djape — Wed, 05 Nov 2008 21:04:32 +0000

Here is something to keep you amused during the coming holiday season…

(click on the cover page to go to lulu and buy!)

US $5.95 or Â£3.45 or â‚¬4.41 (PDF e-book)

(payable by PayPal or credit card)

The book contains 150 puzzles ranging in sizes from 6×6 to a massive 15×15.

And folks, these puzzles aren’t easy, I can tell you that. You will even find 9 INSANE puzzles! I’m just a little worried that I’ve overdone with the difficulty, but we’ll see how you feel.

Enjoy!

How to solve Hidoku: “cornering” (or “dead-end”)

djape — Tue, 04 Nov 2008 10:32:48 +0000

Here is an explanation of a Hidato solving technique that some people might find obvious and they use it without even thinking of it as a special technique. But, for those who still struggle with the more difficult puzzles, here is a quick guide of the technique that I call “cornering“.

It can be used when a cell has only one â€œneighborâ€ that is an empty cell. In such a case, that cell (with only one empty neighbor), must contain a number that is consecutive to (at least) one of the already filled in neighbors.

Look at the upper left corner. Number 33 could in theory go into any of the 4 cells that are neighbors to both 32 and 34. However, it must actually go into R1C1 (row 1, column 1). Why? Because R1C1 has only one empty neighbor and according to the rule I stated above, in such a case that cell must be consecutive to (at least) one of the existing neighbors.
Why? Because each cell (other than 1 and the largest number) must have both a â€œ+1â€ and a â€œ-1â€ neighbor. So, the only options for R1C1 are 31 or 33 or 35. If you put any number other than one of those in R1C1, it would have only one of the â€œ+1â€, â€œ-1â€ neighbors, because there is only room for one number next to it. That is why I also call this technique â€œdead-endâ€. But 31 would be too far from 29; and 35 would be too far from 39. Therefore R1C1=33!

Now, look at R1C7 (itâ€™s circled). See if you can figure out why the number in that cell MUST BE 5.