Solver's Forum
Messages in this topic - RSS

Home » Sudoku Scene » Sumdoku / Sum-doku solving tips? Publish here!

Sudoku fans, share your solving strategies, talk about the types and levels of Sudoku you like best and get help.
3/8/2009 5:57:44 PM

trig
trig
Posts: 1
I've gotten hooked on sum-doku (not kenken) from the crazy for sudoku book. I've gotten the easy and medium puzzles, but can't figure out the hard ones. The sudoku solver won't recognize the puzzles. Anyone have tips for the hard ones? Know a webpage with more comprehensive help? Hey, PennyDell, could you include these in your sudoku solver? Or at least give more stratagies to solve the hard ones?

3/17/2009 1:01:01 PM

2bubbas
2bubbas
Posts: 3
Hi!
I got the most help from this book:
http://www.amazon.com/Revenge-Killer-Sudoku-djape/dp/184753872X/ref=pd_bbs_sr_3?ie=UTF8&s=books&qid=1237308802&sr=8-3
It shows strategies using the 45 property.

5/12/2009 2:53:12 PM

Scrapula
Scrapula
Posts: 6
The hard ones can be quite a challenge. I generally write all the possibilities for a number down. Many of those combinations can be eliminated based on other numbers. I don't have any other hints other than keeping track of all the possible number combinations.

7/25/2009 6:39:31 PM

jeffloeb
jeffloeb
Posts: 77
Dell had a set of Sum-dokus. 2 mags, in 2007 I think. Apparently that "Value Pack" is not offered anymore

BTW. Sudoku Challenge seekers...Check Dell's mags menu often."

11/9/2009 1:08:41 AM

dmeade
dmeade
Posts: 1
Yes dells definatley the best when it comes to sudoku, but I'm starting to get hooked on those http://dailysudoku.info type sites. I wonder if thats going to be the future of sudoku??
<em>edited by dmeade on 11/9/2009</em>

11/17/2009 10:07:14 AM


Guest
Hello,
May we suggest checking out our Sudoku Solver website. You can generate puzzles with varying degrees of difficulty. Basic membership is free and requires only a quick registration.

http://www.pennydellsudokusolver.com/

Happy Solving!
Forum Administrator
<em>edited by Admin on 12/8/2009</em>

12/1/2009 12:47:25 AM

jeffloeb
jeffloeb
Posts: 77
Any thoughts of reviving that small value pack of Sumdokus Dell had a few years ago?

Perhaps adding some Sumdoku volumes?

Dell has Collector series for Jigsaw Sudoku, Samurai Sudoku, and I believe Super Challenger Sudoku.

Also, isn't the Sudoku Solver tailored for magazine puzzles and not one's own puzzle?

1/20/2010 1:36:44 PM

rrpcpa
rrpcpa
Posts: 1
I am starting to get into Sumdoku somewhat, but I really enjoy Ken Ken puzzles...but very difficult to find...and my subscription was cancelled...Evidently, not much interest in these puzzles...just tried a cross sums...kind of interesting but not as good as Ken Ken...if anyone knows of a good subscription or website let me know...thanks

2/17/2010 10:21:28 AM

jeffloeb
jeffloeb
Posts: 77
hey rrcppa!

just u go to a Barnes and Noble store. Or Borders or Books-a-Million. :-)

or, try bn and amazon web sites.

2/17/2010 10:24:43 AM

jeffloeb
jeffloeb
Posts: 77
Administrator: No, I do believe. SudokuSolver is geared to puzzles in a Dell mag. Not on a puzzle that anyone generates. Am I correct??

Jeff

2/18/2010 3:41:17 PM


Guest
jeffloeb wrote:
Administrator: No, I do believe. SudokuSolver is geared to puzzles in a Dell mag. Not on a puzzle that anyone generates. Am I correct??

Jeff


Thank you for your interest in our interactive SudokuSolver website.You are correct, PennyDellSudokuSolver offers puzzles from all of our Sudoku magazines. Once you have the print magazine you can get an access code at PennyDellSudokuSolver.com. When you have accessed the magazine you will be able to interactively solve all the puzzles in that magazine. Enjoy solving at PennyDellSudokuSolver.com.

Admin
<em>edited by Admin on 2/18/2010</em>

8/21/2010 8:23:42 AM

jeffloeb
jeffloeb
Posts: 77
ya'll.

1-800-220-7443. orders only, I believe.

I can't get that dang ordering online to work. (:

8/28/2010 9:29:36 AM

SarahB
SarahB
Posts: 1
To solve the tough sumdokus, when I have exhausted the sudoku strategies, then done the math on the dotted areas, I look at the total of a 3X3 box with not too many ingresses or egresses. I know the egresses must total the sum - 45 and the ingress total = 45 - the sum. Sometimes you get a result for one box; sometimes you get "these two must total 17 (or4,e.g)", sometimes you just get "this one is one less than that one." Combine that with other info and make progress.
This can also be done with two 3X3's adjacent, or three, of course (90, 135). Good luck. Sarah

9/6/2010 10:40:39 AM

jeffloeb
jeffloeb
Posts: 77
yeah. and then there are "the innies and outies".

2/12/2012 1:36:19 PM

pat71896
pat71896
Posts: 3
I use a trick - In a given box, I place a dot in the position of the number - i.e., if the number is 9, the dot would be in the lower left corner; if the number is 2, the dot would be in the top line, middle. Think of the individual box as a 9 place square with a tic-tac-toe grid and each dot has its own position. The number 5 is in the center of the box.

It makes it easier to still see things without a lot of small numbers all around the place.

Hope this helps!

Pat

11/20/2012 1:24:08 PM

pat71896
pat71896
Posts: 3
I have not been on this forum for a long time and perhaps others have already discussed this issue. Just the same, I use the '45' (which is the total of 1- 9 added together) and it helps add a number from time to time.

I don't just use it for the square, I also use it for the horizontal and vertical lines as well. For instance, in a square, if all the totals are included in that square with the exception of one, you can add each group and determine the total gives clues as to the possibility of 'extra' squares. That is, if the totals include 10 or 11 spaces, the 1 or two extra spaces (in an adjoining box) are easier to determine.

Hope this helps!
Pat

11/20/2012 8:56:36 PM

Purple Pisces
Purple Pisces
Posts: 599
Thanks for bumping this thread Pat! smile I really like the Sum Doku not only for the similarities to Cross Sums and Sudoku, but also the differences. Strategies like the 45 rule as well as the "innies" and "outies", which is taking some time getting used to, challenge me in a different way from other puzzles, giving my brain a good workout! smile

Are you guys familiar with Samurai Sudoku? It's where 5 sudoku girds make up 1 large puzzle in an X pattern. Well I just recently discovered "Killer Samurai Sudoku". Killer Sudoku is another name for Sum Doku style puzzles. These puzzles are a real challenge but fun! The main source I know for these puzzles are from the author that 2bubbas posted above, DJ Ape. Definintely not your normal Sudoku! wink

11/21/2012 8:00:30 AM

Chris the Indiana Puzzler
Chris the Indiana Puzzler
Posts: 463
HI Purple - where did you learn the 45 and innie and outie strategies? I could use some tips too.

IN_Puzzler

--
Peace Out.

11/21/2012 6:09:30 PM

Purple Pisces
Purple Pisces
Posts: 599
IN _Puzzler I'm still getting acquainted with the techniques but these two websites have helped me out. You can also google "Killer Sudoku Solving Tips". Killer Sudoku seems to be the more common term for these types of puzzles.

http://www.sudocue.net/killerguide.php

http://www.djape.net/more-math-tip-3-2/
edited by Purple Pisces on 11/21/2012

2/19/2013 7:48:32 AM

PeteTy
PeteTy
Posts: 2
sources for sum-doku (killer Sudoku) solving strategies

http://www.sudokuwiki.org/Killer_Combinations

http://www.sudokuwiki.org/Innies_and_Outies

http://www.sudokuwiki.org/Cage_Splitting

http://en.wikipedia.org/wiki/Killer_sudoku
edited by PeteTy on 2/19/2013

Home » Sudoku Scene » Sumdoku / Sum-doku solving tips? Publish here!





7.2.12.0