Logic Masters Deutschland e.V.

Normal and Diagonal Sudoku rules apply. Each row, column, diagonal 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.

Little Killer Sudoku rules apply. Digits in a diagonal pointed at by an arrow, sum up to the number behind the arrow. The digits on a diagonal may repeat.

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

The puzzle is also available online.