Primemark
(Published on 14. October 2020, 20:12 by PrimeWeasel)
Normal Sudoku Rules Apply
Orthogonally adjacent digits within the red marked area do not sum to a prime number, or they do sum to a prime with value X, which has to be determined. This rule also applies to digits outside the red marked area which are adjacent to a digit within the red area, but not to the 23-pairs already given...
https://f-puzzles.com/?id=y62dto6o
Solution code: Row 2, Row 7, 18 digits, no spaces
Solved by dBass, rimodech, ThrowngNinja, Jon Allan, NikolaZ, steelwool, zorant, Piatato, Vebby, Tacosian
