Prime Sandbattle
(Published on 26. June 2020, 18:44 by Osh Tirola)
Normal Irregular Sudoku rules apply.
Additionally, in each row/column/shape, two digits must be shaded as "stars". These shaded cells cannot touch each other, even diagonally.
The two stars have to be a pair of prime numbers. For instance, in the example above, all 5s and all 2s are the stars.
Also, in each row and column, numbers sandwiched between the stars, have to be primes, or sum up to primes (see example).
Solution code: Enter the digits of row 4 and col 9.
Comments
on 22. March 2021, 09:40 by StefanSch
That was a real challange, thank you!
on 29. August 2020, 15:07 by Osh Tirola
spelling error corrected
on 27. June 2020, 18:59 by Osh Tirola
Clarification of rules: the stars have to be a pair of primes, for example 2s and 5s, or 7s and 2s. So, in other words, once you know for example that 7 is a star, all 7s have to be stars.
