Primesweeper Sudoku
(Published on 23. June 2020, 01:30 by SenatorGronk)
This is the first sudoku I've created. Please let me know what you think.
Rules
- Standard sudoku rules apply
- Each cell with a symbol, and ONLY cells with a symbol, has a value equal to the number of prime numbers it is adjacent to*
- Cells with the same symbol contain different digits
* Prime numbers are 2,3,5 and 7. Adjacency includes both diagonally and orthogonally adjacent cells.
Here's an example with prime numbers highlighted in yellow:
If you would like to solve in penpa-edit, click here.
Solution code: column 4 and row 7 (18 digits, no spaces or separators)
Comments
on 5. May 2021, 21:37 by in_dubio
Thank you for this wonderful puzzle! I'm working on something vaguely similar but with odd/even instead of primes. This was a very useful case study.
on 11. September 2020, 23:55 by geronimo92
Surely the only one i want to solve from SG......
on 14. August 2020, 20:12 by SenatorGronk
@Narayana, I agree ;-). Make sure to tell all your friends.
I'm still not quite sure when the red stars appear. I have another puzzle with 13 solves that still has blue stars.
on 13. August 2020, 18:21 by MartinR
Really nice puzzle, was on my list to have a go at for a while, glad I did :)
(And it seems you can now see the red stars and rating, nice one)
on 10. August 2020, 06:33 by Narayana
Your puzzles need more solves. So far all of them are in blue starts. This and 00040S are probably missing just one or 2 votes to get revealed.
on 25. June 2020, 16:24 by SenatorGronk
Thanks for the feedback, @cam!
I've made that constraint more obvious. That is definitely one of the keys to cracking this :-)
on 23. June 2020, 19:52 by SenatorGronk
I've added an image with an example that should clarify any ambiguity about the rules.
on 23. June 2020, 12:51 by SenatorGronk
Hi, thanks for the feedback! I've updated the explanation.
Because there are more than four circles in the grid and circles must contain different digits, I thought it would be clear that diagonal adjacency is considered.
I make a lot of logic puzzles on Sporcle (https://www.sporcle.com/user/SenatorGronk/quizzes/?order_by=user-released), where these kind of rules are more common.
on 23. June 2020, 07:10 by Narayana
To anybody in the fence of trying this puzzle:
This is an absolutely wonderful puzzle and has a unique solution.
I believe it has a hard start but once you understand what you have to do it is smooth sailing. I hope the setter updates the instructions to make them more appealing. Not everybody is a mathematician and sometimes elementary teachers lie... so to clarify, the one digit prime numbers are 2,3,5,7. Adjacent really means orthogonally AND diagonally adjacent. The count of neighbors includes multiplicities e.g. if 6 is surrounded by 51358723 then it sees 6 primes not 4. So if this were a real example the 6 would be inside of a symbol and no other cell with the same symbol could have a 6. Negative constrains are important!
Enjoy!
on 23. June 2020, 05:25 by RockyRoer
Very fun puzzle! Hope you make more of them -- loved the throwback to minesweeper-- tried making one myself a few weeks ago but couldn't find a fun way to make it work. This worked well.
@glum_hippo -- yes, it's all 8 directions.
@sillypeoplewhothink1isprime... it isn't.
on 23. June 2020, 02:51 by glum_hippo
adjacent diagonally as well as orthogonally? Am I looking at 8 squares or 4?
