Seems ok to me. Any change today?

So glad you like the site, many thanks for the kind words.

True, I would like to see a solver that allows full coloring. I've started that on the website solver but its automatic rather than manual, and only does bi-location links. I am looking at adding something more sophisticated for the SudokuWiki solver app. Its would be very difficult to do for the cell phone version but possible on an Android tablet. Also a good idea to add cell marking. You can currently highlight any sets of numbers of you click on a cell with those numbers in it. But a pallet of numbers you can turn on/off would be nice as well

I'd love to see both solutions. Never had one with a double solution in all these years, but I can help you detect the problem if I can see them

Talking about
http://www.sudokuwiki.org/Daily_Jigsaw_Sudoku
?
The 30 day archive has puzzles on Monday which are the easiest.
Also, there is an easy jigsaw on
http://www.sudokuwiki.org/5_Daily_Puzzles_for_the_iPad
every day

That is an interesting situation in that puzzle. I do tack on checks for validity now and again when I see a hole in the validation. Looks like another hole. I can see that 1/5/6 want to fit in only two cells. Any puzzle that doesn’t have exactly one solution will not produce a credible solution path on my solver, for logical reasons.

Ok fixed it. iPad was defaulting to quite a large padding, set that to zero. Made the font smaller. Also, I've changed the input box type to number so the right keyboard popups up on the ipad

The solver is designed to tackle the puzzle at any given stage without memorizing any previous steps. Such memory retention would be extremely complex to implement on the server side with so many different users and on the client side when you could potentially have many solvers open. But in fact is doesn't need a memory because each state contains all the information necessary to proceed to the next step. Also, in Sudoku, it doesn’t need to distinguish between cells that are clues and those which are previously solved cells. I do allow this distinction in the small board with "enter clues or solutions" which gives you the two colors for large numbers. But as far as solving that is cosmetic.

So given that, a reset button is impossible to implement because there is nothing in the puzzle itself that says "this is the start". That is equivalent to asking "is this puzzle minimal" in the sense that all the clues are necessary. But some published puzzles are easier because they have extra clues and the minimal requirement is not a requirement for publishing.

But, we can brush all that aside by having the user decide the puzzle is at the start. So what you need is the "Save" and "Re-load" buttons which are above the small board. That does what you ask, but you need to remember to hit "save". I suppose if the puzzle information was in the URL a "restart" would be possible but I'd have to hide the button if the URL wasn't being used. I'll try that out.

David Filmer has kindly provided me with some of his puzzles that he's created. I'm finding it a very long process to get decent unsolvables now and he's been working on very hard puzzles for some time with a lot of success. Check the name under the page title where it says "guest compiler" so you know it's one of his.

Very nice! Well done, I love to see puzzles with a pattern. Everyone click on the Sudoku link!

Sorry for the late reply. Good point. There does need to be a quicker and more accessible explanation of the grading and scoring system. It's kind been buried. It is quite a complex issue but I do have a long answer :
http://www.sudokuwiki.org/Sudoku_Creation_and_Grading.pdf

What I need to do is provide a cut down page and link to it directly from the solver. Added to job queue