Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.

Antiknight Sudoku rules apply. Cells that are a knight's move away from each other cannot contain the same digit.

Arrow Sudoku rules apply. Digits along the arrows in the grid must sum to the digit in its circle.

The grey lines are palindromes: they are sequences of digits which read the same backward as forward (for example: 1374731).

The grey circles are odd digits. The grey squares are even digits.

The puzzle is also available online.