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Killer Sudoku

Another interesting variation of Sudoku that will test your logic skills. Killer Sudoku follows the same sudoku rules except you are given clues in the form of totals for a group of boxes which will give clues from which you can deduce the numbers.

Try Killer Samurai Sudoku:

Killer Sudoku

5 interconnected Killer Sudoku Puzzles in Colour.

Download Puzzle - Solution

killer sudoku 2

killer sudoku 1

Killer Sudoku 1 and Solution - Download

The Sudoku Puzzles that were orignally here have now been removed. They can be found at: http://www.timesonline.co.uk/article/0,,7-1757275,00.html

Solutions for all Times Killer Sudoku Puzzles in the link above - Download


35 Comments

man, these are rock hard! I'm struggling on the tricky one at the moment....25 mins - you must be joking!! good luck people
Comment 1 by Matt. Made on the 08th Sep 2005.
Just done the gentle and the moderate so far. Very tricky stuff, so easy to go wrong too! But oh so good!
Comment 2 by Doogie. Made on the 08th Sep 2005.
The only combination
Sum Number Place(Killer Su Doku)
www7a.biglobe.ne.jp/~sumnumberplace/index.html
from Japan
Comment 3 by Miyuki. Made on the 09th Sep 2005.
Just a point which I don't think is made clear. I assumed that within a "dotted" box the same number can't be duplicated. (Possible if the box crosses a 3x3 boundary and is not a straight line!) In other words the only possibilty for a 3 square dog-legged box summing to 23 is 9,8,6 but 8,7,8 is not allowed. Any ideas?
Comment 4 by Brendan. Made on the 10th Sep 2005.
Whoops!!! Just looked at the link in comment 3. Under the "How to Play" section it confirms my hypothesis in my previous comment. This is not made clear in the Times. Sorry!
Comment 5 by Brendan. Made on the 10th Sep 2005.
Sorry,
One of rules was not made clear in the Times.
We did not notice.
Thank you for teaching.

Comment 6 by Miyuki. Made on the 13th Sep 2005.
I was struggling with Killer no. 7 in the Times until I read the interview with the Japanese creator which implied this rule (he said that there was only 1 way to make 24 in a 3 box "sum" - thus 9+8+7 which ruled out 9+6+9 ). Once I realised this it became a lot easier.

Andy
Comment 7 by Andy Owen. Made on the 13th Sep 2005.
Is there a solution available to the Deadly Killer? I thought I had it only to have made a small mistake somewhere!
Comment 8 by Argon0. Made on the 15th Sep 2005.
Never mind - worked it out!
Made a mistake in bottom left hand corner!
Comment 9 by Argon0. Made on the 15th Sep 2005.
Wow! I love sudoku but i ADORE killer sudoku! my mate gave me one as a joke and i completed it, whos laughing now, lol! im an A level student currently but i love taking breaks from my work and doing killer sudoku, its taken sudoku to a whole new level! thank you!
Comment 10 by Hannah Carey. Made on the 15th Sep 2005.
Can somebody acctually solve sudoku killer moderate,time:20 minutes in that time? It took us hours, but we succeeded. and we enjoyed it!
Comment 11 by monika. Made on the 17th Sep 2005.
I am finding the Killer sudoku easier than the normal sudoku.Am I a geek??
A good clue is that each block adds up to 45
Comment 12 by karin. Made on the 17th Sep 2005.
Good idea !
I think the given times are very short.
One thing is not clear in rules : can we duplicate a nomber in a total (forgive my english)?
Comment 13 by Pascal. Made on the 18th Sep 2005.
Thanks for pointing out the rule that the times forgot to mention. I thought I was going mad as even the easy ones seemed impossible!
Comment 14 by Jo. Made on the 20th Sep 2005.
please help me
i thought i was good at killer sudoku.. i do all the times puzzles but i am stuck on the tricky one of your killer ... are there answers anywhere
Comment 15 by Cindy. Made on the 23rd Sep 2005.
Thank you for putting Killer Sudoku online. Yours are much harder than those on Times, but entertaining and challenging ... Will you be posting more?
Comment 16 by Jim. Made on the 26th Sep 2005.
pls tell me where i can find answer to tricky.. ill pay you!
Comment 17 by cindy. Made on the 26th Sep 2005.
In The Times Killer Sudoku book puzzle 91 in tough section seems to contradict the unwritten rule of unique numbers in the groupings i.e. there is a grouping of 3 with total of 26 which must be 9,8,9 and in same puzzle a grouping of 3 totalling 8 which turn out to be 2,4,2 (more frustrating as I was temporarily led astray). Only one I am aware of and their examples implicitly assume the rule.
Comment 18 by lawrence. Made on the 06th Oct 2005.
Karin is right in her comment back in September - Killer is easier in a way than ordinary Sudoku. I think the easy puzzles are much easier than easy ordinary Sudoku, but maybe the harder Killers are harder than the hard Sudokus. Anyway, I'm not sure it's about how hard it is: once you have all the techniques it's about application and concentration. That doesn't make it less good though.
Comment 19 by Cathers Rose. Made on the 12th Oct 2005.
I also noticed the problem with puzzle 91. It's a mistake and if you note the contributer at the front it's the only puzzle that he contributed.
Comment 20 by wendy. Made on the 18th Oct 2005.
Mistake in the Tricky sudoku makes the puzzel truely impossible although obviously so. 6th line from top two box's of two side by side add up to 17!! this would require the only solution be to replicate within a square the number 8 or 9, don't know how long this site has been around but you would have thought this would be an easy pick up
Comment 21 by kitty. Made on the 19th Oct 2005.
Kitty you need to take a look at the tricky one again. One of the 17s has 2 boxes but the other has 3!
Comment 22 by David. Made on the 19th Oct 2005.
www.killer-sudoku.com the definitive Solver for sudoku killers.

Comment 23 by Jose. Made on the 26th Oct 2005.
New Sum Number Place (Killer Su Doku) variation.
Sum's figures not at all.
www7a.biglobe.ne.jp/~sumnumberplace/
Comment 24 by Miyuki. Made on the 30th Oct 2005.
how do u start off on a killer sudoku when there r none of the dotted boxes with just one number??im a bit confused!thanks :-)
Comment 25 by sally. Made on the 30th Oct 2005.
Hello Sally. This is a question a lot of begginers ask. Its quite easy really. If you look at the killer sudoku puzzle above you will see the three larger boxes on the far left column. All there dotted line totals are inside those 3 boxes except 1. Which is leaking into the bottom middle box.

Now all we do is a simple bit of elimination. We know that the 3 boxs on the left should total up to 45*3=135. However if you add up all the dotted line totals it will equal 144. Therfore the dotted line totalling to 15 with the square leaking into the bottom middle box must be 144-135=9.
You have then just found your first answer.

Hope that helps
Comment 26 by Daniel (Site Owner). Made on the 30th Oct 2005.
All about sudoku games at http://www.sudoku.ya.st
Thank you for your killers samurais
Comment 27 by sudokume. Made on the 04th Nov 2005.
Thank you for giving us the killer!!!
My work collegues used to tease me when I started at sudoku, but now they're all hooked and I've moved on to killer!
It's the best way to relax your mind!
Please post some more killers! Yours are the best!
Comment 28 by Filipa. Made on the 06th Nov 2005.
it is like great dude
Comment 29 by babe. Made on the 11th Nov 2005.
where can i play it online i cant find it where is it no actually where am i
love ya x
Comment 30 by ice. Made on the 11th Nov 2005.
Sudokus are very very fun and brain storming!
They are also very challenging
Comment 31 by Sam. Made on the 28th Nov 2005.
you can find a sudoku killer solver made with Java on www.sudoku.org.es . Still is a beta version, this means it will work fine when you
select the cells correctly, otherwise ...
Comment 32 by elibm. Made on the 30th Nov 2005.
I made an italian reference for killer sudoku at my site www.killersudoku.it with schemas (given by Djape) to be completed, solving tips and curiosities.
Thank you for the killer samurai, they're unique and interestingly addicited...
Comment 33 by teostress. Made on the 25th Dec 2005.
that's great!!
Comment 34 by sutlu. Made on the 28th Dec 2005.
You can also play killer sudoku directly online at www.killersudokuonline.com
Comment 35 by Seth. Made on the 06th Jan 2006.

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What is Sudoku?

Sudoku is a Number Puzzle that requires no mathematical knowledge. (no adding or multiplication). It is based upon Japanese style crosswords where you are required to use logic to place numbers onto a 9x9 grid.

Rules

To solve the puzzle you must make sure that every column, row and 3x3 box contains the numbers 1 through to 9. Almost all of the puzzles can be solved using logic alone and there is no need to guess. A puzzle can take from 20 minutes to 2 hours to complete depending on its level and your experience.

Sudoku Fact

For a 9x9 puzzle to have precisely one solution, the initial entries need to include at least eight of the nine digits.

Sudoku Fact

The smallest number of starter clues on a sudoku puzzle is 17.

Sudoku Fact

Sudoku became a world hit in 2005. When measuring its popularity in enigmatic world, it is the biggest phenomenon since Rubik's Cube in the '80s.

Sudoku Fact

Some people call it newspapers saver because it boosts their sales and keeps the reader audience active. Newspapers around the world embraced it immediately because people like to solve Sudoku on a daily basis, just like crosswords.

Sudoku Fact

By playing it regularly you can boost your concentration and focus, prevent or ease depression, dementia and even Alzheimer's disease according to some studies.