Four Neighbor Sudoku01
(Published on 3. February 2021, 04:05 by cdwg2000)
This is a new variant, so just introduce a simple rule set.
Four Neighbor Sudoku
1. Apply the classic Sudoku rules.
2. The relationship between the number of the circled grid and its surrounding neighbors: the upper neighbor is greater than it; the lower neighbor is less than it; the neighbor on the left is an odd number; the neighbor on the right is an even number. Absent cells are not considered.
3. All qualified cells are marked with "○".
Author: Puzzles Lu(芦向明), from China, this question comes from his personal blog.
Solution code: Row 6,Coloum 5.
Comments
on 31. January 2023, 14:17 by zrbakhtiar
solvers need not to be aware of negative constraint
on 12. February 2021, 18:05 by wentel21
Nice puzzle ;) love it
on 8. February 2021, 17:00 by TonyN
@steelwool If a circled number does not have 4 orthogonal neighbors (= adjacent to an edge) only apply the rules to the neighbors that are present.
on 5. February 2021, 23:10 by cdwg2000
@steelwool
If the orthogonal adjacent grid of a cell is less than 4, the missing direction (up, down, left, and right) is ignored.
on 5. February 2021, 18:47 by steelwool
I keep breaking this, so I am probably doing something silly. What does 'absent cells are not considered mean'?
on 3. February 2021, 22:29 by zhergan
It was fun to solve it. Thanks :)
on 3. February 2021, 19:58 by panthchesh
This was a fun variant! :)
on 3. February 2021, 18:28 by Grumpy
This was a fun one!
on 3. February 2021, 15:37 by shudd
That was fun, nice puzzle
on 3. February 2021, 13:53 by ElimGarak
I liked that Sudoku and the rule set very much. Please more of it.
on 3. February 2021, 13:35 by cdwg2000
Added F-puzzles link. Thanks ElimGarak.
on 3. February 2021, 13:14 by ElimGarak
f-puzzles: https://f-puzzles.com/?id=y4amfuns
