I want some really hard "killers"

For fans of Killer Sudoku, Samurai Sudoku and other variants

I want some really hard "killers"

Postby EricK » Thu Jan 19, 2006 11:28 pm

I really enjoy doing Killer Sudokus, but I find that almost all the ones that are available are too easy.

Where can I find tough ones?

eg like the third one on this page:

or the two on this page:
(which aren't traditional killers but clearly related)


Posts: 4
Joined: 19 January 2006

Postby CathyW » Thu Jan 19, 2006 11:39 pm

Hi Eric

Try www.djape.net

DJ has some tough killers - Insane level are the hardest - but they are all more challenging than the offerings from the Times. You should find the previous five killers in the puzzle archive. Also check the links in some of the messages from the Daily Killer page as there are a couple of other testing puzzles. Also there are a few overlapping Killer puzzles - a 'Butterfly' currently on the home page and previously 'Samurais' though I'm not sure if they will still be in the archive.

You can also try www.ndorward.com/blog/?page_id=71

Nate has some seriously evil ones:!: Start with the first ... I'm still stuck on No. 7 and had to 'cheat' and get some tips to do No. 6.

Have fun:)
Posts: 316
Joined: 20 June 2005

Postby EricK » Fri Jan 20, 2006 7:36 pm

Thanks Cathy,

I am enjoying the ones on this site:

I am currently stuck on number 6, having only managed to put a single number in so far.:(

I couldn't do number 4 without having to guess, but I assume there was some cunning trick I missed.

Posts: 4
Joined: 19 January 2006

Postby nd » Fri Jan 27, 2006 5:47 am

Glad you're enjoying the puzzles! -- #8 is nearly ready to go but I'm just very busy this week. Will try to have it up sometime tomorrow... Good luck! Yeah, if you've been driven nuts just go ahead & ghuess, but there is a logical path without trial & error to solve all the puzzles. I've posted some partial walkthroughs to get people started for #4, #6, & #7 (the hardest ones). If you poke around the comments thread you should find walkthroughs & tips from some other solvers too. If you want to be amazed, try the #6-alt puzzle--I couldn't solve it myself (it's a "rogue puzzle" I created partially by accident) but udosuk managed to crack it, & his walkthrough is extremely illuminating if you want to pick up tips on how to approach really, really hard puzzles.

If you want hard ones the other place to go is JC Godart's site:


There's also the Killer Sudoku Online site, it's linked to on the sidebar of my blog page. They seem to post a rather odd mix of pretty-easy & incredibly difficult puzzles.
Posts: 28
Joined: 11 September 2005

Postby nd » Sun Jan 29, 2006 4:27 am

Just uploaded #8 to the site... it's fairly hard without being as demonic as #6 or #7, so a little more userfriendly!

J-C Godart's puzzles are now at


by the way, including the very nasty B2 puzzle.
Posts: 28
Joined: 11 September 2005

Postby nd » Sun Jan 29, 2006 5:37 am

bleah, found a typo in it (misread "25" as "23" in my handwriting in the bottom row)--fixed it but if you downloaded it in the last 20 minutes or so then go back & get it again...!
Posts: 28
Joined: 11 September 2005

Postby udosuk » Wed Feb 01, 2006 12:59 pm

You want "really hard" killers, try this site:

Be warned: you might wish you hadn't known it after you try it!
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Joined: 17 July 2005

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