Locked out, Blacked out, and Blue
(Published on 15. July 2025, 01:33 by chrisjnap)
Normal sudoku rules apply.
The sum of a black dot cell and all of its orthogonal neighbors is the same for each black dot.
Blue lines are Region Sum lines wherein 3x3 box borders divide them into segments with the same sum.
Digits along a lockout line must not be between the digits in the diamonds at the ends of the line, which have a difference of at least 4.
Solution code: Enter Column 9
Comments
on 15. July 2025, 03:36 by NotSoMagnifique
This one will knock you black and blue, but it's worth it!
on 15. July 2025, 03:07 by sanabas
Was a fun one to test. Constraint on all black dots having their neighbours have an identical sum led to some interesting logic.
on 15. July 2025, 03:02 by Mattisahuman
The unique constraint being used one last time at the end is so beautiful
