An anti-arrow nigthmare (3x3)
(Published on 17. July 2025, 22:03 by Sudokode)
In this puzzle, I tried experimenting with an interesting constraint: "Anti-arrow". To create the puzzle, I wrote a little computer program that helped me a lot, and so I was unsure if the puzzle was actually humanly solvable, but I found a clear logic path that leads to the solution afterwards. This puzzle is really hard and may take a while to solve. By the way, this is my first puzzle.
Rules:
Normal sudoku rules apply: Place the digits 1 to 9 in the box so that no digit repeats.
Arrows:
- Digits along an arrow sum to the digit in that arrow circle, which is always located at the arrow's base.
- Arrows can't branch and can't visit a cell more than once.
- Arrows can travel orthogonally and diagonally.
Anti-Arrow: All possible arrows are given.
Prime row: A "P" next to a row indicates that the 3-digit number formed by the digits in that row is a prime number (reading from the "P").
I apologize for my bad English. (I'm a french high school student)
Puzzle:
Hope you enjoy it!
Solution code: All the digits from top to bottom in reading order
Comments
on 15. August 2025, 21:16 by RailMan
That was a nice puzzle. I like the logic that is hiding in there. Well done!
on 18. July 2025, 23:04 by Sudokode
Updated rules.
on 18. July 2025, 17:47 by Sudokode
Changed the difficulty from 5* to 4*
on 18. July 2025, 01:35 by Sudokode
Updated unclear rules.
on 18. July 2025, 01:32 by Sudokode
@blueberrypug When read from left to right they form a 3-digit prime number. Sorry for the unclear phrasing.
on 18. July 2025, 01:21 by blueberrypug
quick question, for the prime rule, does it mean that the numbers in that row sum to a prime number, or does it mean that when read left to right they form a 3-digit prime number
