# Feedback and Questions

I've received a lot of interesting comments and questions from Sudoku fans over the last few years and this page
is where I try to answer them. Please feel free to drop me a note on the side of the page or try the Facebook
comment box. Or you can email me directly at andrew@str8ts.com.
**Post a Comment or Question here...**

## Wednesday 28-Mar-2012

## ... by: John Grasberger, San Diego

## Thursday 22-Mar-2012

## ... by: Andrew Stuart, Norfolk, UK

## Sunday 18-Mar-2012

## ... by: Anna, Germany

## Sunday 18-Mar-2012

## ... by: Tom Veil, US

Any plans to extend the KenKen/KenDoKu solvers out to 9x9??

tnx

tv

## Saturday 17-Mar-2012

## ... by: Tim Reynolds, Anderson IN

Load Sudoku: CLICK TO LOADAlso the grader drops the grade when 7 is removed from A4.

But your example does inspire me to change the grader to check for solutions since the grade should be meaningless with more than one solution.

On the grade drop - I have found that the number of clues has no relevance to the grade apart from making the puzzle longer - which can accumulate scoring points and boost the grade slightly. It is easy to make 17 clue puzzles that are trivial and 32 clue puzzles that are diabolical, so it it not indicative of anything that adding or removing a clue changes the grade.

## Friday 16-Mar-2012

## ... by: Roggey, Uk

Trying to load a sudoku into your grid on an iPad is a nightmare. You have to tap each square separately then select numbers. Then repeat the whole process for the next number. If you get out of sync and tap the wrong thing the whole entry gets lost and you have to start from scratch.

Is there anything you can do to improve this.

Best regards

Roger

## Thursday 15-Mar-2012

## ... by: JG, CA

For example, I can turn everything off on the solver except 'X-cycles' and if an X-cycle exists in the puzzle, the solver will only show the first one it finds. It would be very useful for learning to also have the solver optionally show the 2nd, 3rd, etc other X-cycles in the puzzle for a given step if more such possibilities exist.

The strategy overviews are excellent. Great site. JG

## Wednesday 14-Mar-2012

## ... by: Hondo500, California

Run out of known strategies. Use 'Solution Count' to check the puzzle has only one solution.

Should it have said "to check to see if the puzzle has only one solution" ?

Or was it saying that the puzzle has only one solution?

When i did check the solution count, it indicated 27 solutions. So what does that mean, that there are 27 solutions? i thought Sodoku puzzles only had one solution???

On multiple solutions - The solver uses logical strategies to take one through the solution path, so a single solution is required. Anything with multiple solutions is not a proper puzzle and will not solve logically - since it is ambiguous what the solution will be. The Solution Count uses a rapid brute force method to calculate the solutions - a very different approach - and can provide all those solutions, however many there are. Some publishers don't know how to check for multiple solutions so they are publishing garbage, to be frank, because a user expects a single solutions. But if you miss off a clue, or put the wrong number in, zero or many solutions are also possible and a logical outcome is not possible.

## Saturday 10-Mar-2012

## ... by: kit_kat_130, usa

i was very sorry to hear about the hacking of your site, which remains absolutely the best. and thanks so much for adding daily jigsaw puzzles as they are my top favorite.

thanks again. kit

Thanks for the alert, I hadn't caught the bug. Glad you are enjoying the puzzles!

## Thursday 8-Mar-2012

## ... by: Nick Winter, UK/France

## Tuesday 6-Mar-2012

## ... by: Joseph, US