Rules:
-Normal sudoku rules apply.
-Marupeke: Within the WHITE AREA, no more than two consecutive cells, either horizontally, vertically or diagonally, contain the same ODD or EVEN parity.
-Palindrome: Along grey lines, digits must read as the same sequence from both ends.
-Quadruple: Digits in circles within the grid must appear at least once somewhere in the four cells adjacent to the circle.
Previous Puzzle:
Solution code: Row 3 followed by Column 7 (no spaces)
on 23. January 2022, 14:51 by krangune
very nice puzzle and the symmetry of it was very beautiful!