Snake Sum Sudoku 1
(Published on 26. June 2020, 16:44 by Quarterthru)
Snake Sum Sudoku 1
Normal sudoku rules apply except that the regions are irregular.
Additionally, a snake has to be drawn into the grid. The head and tail of the snake are in the two cells with the grey circles. The snake may not touch itself orthogonally, but it can touch itself diagonally.
The clues outside the grid indicate the sum of the digits located on the snake in the respective row/column. Considering "Snake" and "non-snake" as two colors, the given digits show how many cells orthogonally connected to the given are of a different color to the color of the given cell itself. All such possible digits are shown. NOTE: Digits placed by the solver CANNOT be true or they would have been given
Givens can be on or off the snake.
Here is a link to the puzzle on penpa
Here is a link to the puzzle on f-puzzles
Solution code: All digits Row 7 Left to Right
Comments
on 24. May 2021, 20:54 by Quarterthru
@PixelPlucker, Thank you for visiting the series. My first published puzzles on here, and the only ruleset I've ever created myself, I think it came out quite well. I've tried to get CTC to look at more of them, but to no avail.
on 24. May 2021, 17:32 by PixelPlucker
I did the CTC edition of this ruleset way back, and decided to revisit this series. It's staggeringly fun... and there's five more! Can't wait to try the rest!
on 14. April 2021, 04:59 by Quarterthru
Added f-puzzles link
on 12. July 2020, 20:26 by Phistomefel
A lovely idea and fantastically executed. Thanks for this puzzle!
on 11. July 2020, 19:08 by henrypijames
@bob: Congrats! I really like this series of puzzles as well. As a preview: #2 has been the most enjoyable for me so far; #3 has a really hard sudoku (harder than this one) after drawing the snake; #4 is relatively easy; and upcoming #5 is supposed to super hard.
on 11. July 2020, 17:36 by Mody
Große Klasse, hat viel Spaß gemacht
on 11. July 2020, 14:29 by henrypijames
@bob: Your snake might be wrong, because you shouldn't be able to draw it without filling a bunch of digits in the process - the digits forcing the snake to be here and there. After drawing the snake, those digits you've already filled should help you do the sudoku (still not easy though).
And most importantly: Don't forget the negative constraint! Digits not given cannot be indicators of snake-parity of adjacent cells. That helps you eliminate some crucial possibilities for 1234. In fact, I now start every Snake Sum Sudoku by pencilling all possibilities of 123 (4 is a bit too unconstrained). By the time the snake is done (with the help of those 123 pencilmarks), usually more than half of all 123 are placed.
on 10. July 2020, 00:28 by bob
I'm pretty sure I located the snake, but am rewarded with a nearly impossible sudoku. Most of the sums provide little help.
on 28. June 2020, 16:32 by Quarterthru
changed difficulty to 4 stars based on suggestion. though it won't matter for long
on 28. June 2020, 06:22 by Quarterthru
added penpa link
on 27. June 2020, 17:10 by Quarterthru
Attempted fix of German version
on 27. June 2020, 16:16 by henrypijames
There is an image only if you switch to English, but if your site language is German there is no image.
on 27. June 2020, 15:58 by cdwg2000
Very Nice!The difficulty should have four stars.
on 27. June 2020, 15:58 by Quarterthru
If anyone is having trouble seeing the image here is a penpa link.
https://tinyurl.com/y8enwlcz
on 27. June 2020, 13:57 by henrypijames
There is no imagine of the grid? Even the HTML soucecode of this page shows no <img> within the puzzle description (so it's not image server down) - did you accidentally delete the grid when you edited the rules?
on 26. June 2020, 19:29 by Quarterthru
Clarified outside numbers
on 26. June 2020, 18:22 by Greg
@Big_Tiger:The numbers outside represent the sum of all digits that appear on the snake in that respective row or column.
on 26. June 2020, 18:12 by Big Tiger
I'm a little lost on exactly what the numbers outside the grid demonstrate.
