Logic Masters Deutschland e.V.

This is my second sudoku puzzle.

Normal sudoku rules apply. Fill each cells with digits 1 to 4 such that each box, row and column contains exactly one of each digits.

Parity Line: Consecutive digits on a red parity lines must alternate between odd and even.

Palindrome Line: Digits along a grey palindrome line forms a palindromic number. Ex. 2332 and 1441.

Region Sum Line: Blue region sum lines are split into segments by the borders of the 2x2 boxes. The sum of a segment matches the other segments on the same line.

Additionally, there are mismatched digits when the complete sudoku board gets rotated by 180°.