Normal sudoku rules apply. Place the digits 1-9 in each row/column/box. The center digit in the grid must be larger than all orthogonal adjacent cells.
Palindrome - Gray lines must read the same in both directions.
German Whispers - Digits along a green line must differ by at least 5.
Kropki - Digits separated by a white dot are consecutive digits.
Quadruple - Digits in white circles must be present in the 4 adjacent cells.
Solution code: Column 2 followed by Row 2, 18 digits no spaces.
on 6. November 2023, 12:12 by gUBBLOR
Fantastic puzzle, thank you for setting!