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Sample Puzzles!
Take it Easy
I realised that I’ve never posted an “Easy” Killer puzzle. So, in preparation for the weekend I just uploaded a new puzzle, rated Easy. By the way, which ever “difficulty” is in the lead tomorrow – I will post a puzzle with that rating. It look like it’s either going to be “IQ” or “Insane”.
Enjoy!
Complex innies/outies – part two
I saw two comments (by Graham and David) for the puzzle posted on October 25, and I think there’s a little clarification on “complext innies/outies” that should be made here.
You should look for innies/outies in more than just one row/column/nonet. This is a good example of such puzzle. See this image:
Click on the puzzle thumbnail to access the puzzle.
The cell outlined in red is the only cell sticking out of all cages that belong to the first 5 columns. So it’s value must be:
(Sum of All Cages in First 5 Columns) – 5*45.
In this case it equates to:
(4+9+15+28+10+17+21+12+14+7+24+11+12+21+14+13)-5*45 = 232 – 225 = 7.
Of course you could’ve done it the other way – as an innie of the last 4 columns.
And remember – whenever you find an innie/outie in a symetrical puzzle, there’s always one more – exactly opposite to the one you just found. I hope you see which one I’m talking about. It’s a coincidence that in this puzzle the value of the opposite innie/outie is identical (it’s also 7).
Once you solve those two and solve the two cells in the upper left corner, there’s nothing fancy about yesterday’s puzzle :).
Posted in Free sample puzzles, Killer Sudoku, Solving tips
Tagged innie, INNIES, outie, OUTIES
3 Responses
Changes in difficulty level
I must let you know that I’ve been working on improving the part of my software that determines the difficulty of a puzzle. Therefore, for the puzzle that I will post in a few moments, if you try to open it in “Perfect Sudoku” software, you will get a different rating from what’s indicated in the puzzle. So don’t be confused about it.
By the way, I am really surprised by the current results of the poll. I was really under the impression that the puzzles I’m posting are too difficult and was trying to change that – but you’re asking for even tougher ones! Insane puzzles, which are in the lead at the moment, either require trial and error (just like September 27 – but I won’t post such puzzles anymore), or require repeating combinations of Cage Splitting and naked/hidden/match subsets.
If “insane” are still in the lead on Friday – I will post one then. But no complaints! 🙂
New poll
I’m closing the Mobile phone poll. I’ve been so busy with other things so I’m not sure when will I get my head around implementing Perfect Sudoku for mobiles. Here are the results:
101 Perfect Killer Book
It is my pleasure to announce that we have partnered with Via Optima publishing house from Portugal and that they will be printing a book with Perfect Killer Sudoku puzzles! The book should be available in bookstores around mid November. At the moment, it will be published only in Portugal.
We are looking for publishers in other countries too. If you refer us to a publisher and they eventually print our book, we’ll surely reward you with a free copy of the book. All proposals please send to sudoku@djapedjape.com
Posted in Bookstores, General, Killer Sudoku, Puzzle books
Tagged BOOK, books, bookstore, FREE, killer, killer sudoku, Portugal
1 Response
Cool your brains!
According to the comments, a lot of people enjoyed the IQ Killer posted on Friday. It’s time to cool your brains off a little, with the today’s “COOL” puzzle. For those who haven’t had enough, I posted a really tough Diagonal classic Sudoku.
We’re doing quite well on the top 50 Sudoku sites list. A few days ago we finished 4th! We’re normally in the top 10.
Have fun and send more feedback!
Samurai number 5
Samurai X for Saturday, October 22 – this is the only place you can find these kind of Sudoku puzzles!
Basically, not only do you have to fight against 5 interconnected Sudokus, but you also need to be carefull about the diagonals: ALL diagonals in the puzzle must contain one occurrence of each 1-9 digit. The diagonals are marked in the puzzle so you wouldn’t forget about them.
Click on the puzzle thumbnail to access the puzzle.
IQ Friday
First of all, I think that the download issues have been rectified. People aren’t complaining about downloading puzzles anymore, so I reckon it’s working fine for all of you.
Also, I posted two puzzles just now.
The Killer is rated “IQ”. It should be challenging but not terribly difficult. You should all solve it by Monday! 🙂
The classic Sudoku is an interesting one – it’s a 4×3, not 3×3. So you use letters A-L to solve it.
Don’t forget that tomorrow is Saturday – the day for a weekly Samurai X.
Enjoy your weekend!
Problems downloading daily puzzles?
If you have a problem downloading daily puzzles, please try a couple of times (if the page reloads try again!) and if it still doesn’t work please send an e-mail to sudoku@djapedjape.com with a detailed description.
In response, I will e-mail you today’s puzzle and also work on fixing the problem.
It is unfortunate that I had to change the way puzzles are downloaded but I had no choice – fake downloads from other sources is something that I had to avoid.
I will do my best to make the puzzles available to all our visitors.
Posted in General
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A few words about “Perfection”
Ever since I started posting “Killer” Sudokus I was unhappy for one reason: the puzzles posted did not meet one criteria that I was hoping they would fulfill – they were not perfect. Yes, I admit that. You might wonder why I say that. Two reasons:
1) September 27 puzzle. It required trial and error. A terrible imperfection. Pretty much unsolvable by a human. Ok, a few guys managed to solve it with limited trial and error – but it’s still trial and error. And that’s not pure.
2) Singleton cages. Occassionally a puzzle that I posted would have a cage consisting of one cell only. So it was somewhere in between a classic Sudoku and a Killer. I don’t like being in between. Therefore, such puzzles were also imperfect.
I’m glad to announce that I’ve rectified both problems. My generator now does make PERFECT Killer Sudokus only. You won’t see singleton cages anymore. And you won’t ever need to “bifurcate” when solving puzzles posted on this site.
Of course, the Killer Sudoku solver can still cope with both beasts – if a puzzle has a solution that can be found only by trial&error – it will find it. It won’t mind singleton cells either.
I know that I’ve been saying that the new version of Perfect Sudoku will be available “soon”. I hope you now understand why it’s been delayed – I was working on my generator which is the most important part of my program.
Posted in Killer Sudoku
Tagged Classic Sudoku, killer, killer sudoku, Killer Sudokus, PERFECT, Perfect Sudoku
2 Responses
