Logic Masters Deutschland e.V.

1. You do not talk about fight club.

2. You do not talk about fight club.

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

4. Antiknight Sudoku rules apply. Digits cannot be a knight's move apart from each other.

5. Grey squares are even numbers, grey circles are odd numbers.

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

7. The inequality signs between two cells show which one contains the lower/higher digit.

8. The sum of the numbers on the "F" is 28. The sum of the numbers on the "C" is 23.

Note: The "F" is made of three palindromes: R5C4-R6C3; R6C5-R7C4 and R6C3-R7C4-R8C5.

This is a hard puzzle, so if you need some help, my fellow setter, rangsk made a showcase video about the solution path: Fight Club showcase

The puzzle is also available online.