Normal and Diagonal Sudoku rules apply. Each row, column, diagonal and 3x3 box contains each number from 1 to 9 exactly once.
All orthogonally adjacent cells with the sum of 5 are marked with a V, and with the sum of 10 are marked with an X. This is also a negative constraint (where there is no V or X between the cells, the sum of the 2 cells is not 5 or 10)!
Additionally the sum of the two red cells equals the sum of the two grey cells.
The puzzle is also available online.
Lösungscode: Row 6 and Column 8