Logic Masters Deutschland e.V.

Normal Sudoku rules, Palindrome rules, Odd cell rules, Kropki rules (no negative constraint) and Little Killer rules:
- Each row, column and box must contain the digits 1-9.
- Digits along a thick grey line must form a palindrome.
- Cells with a grey circle must contain an odd digit.
- Digits connected by a white dot are consecutive. Digits connected by a black dot have a ratio of 2:1.
- Numbers outside the grid are the sum of the digits along their diagonal.

*Odd* Knight's constraint: Odd digits may not be placed a Knight's move apart from each other.

To avoid confusion, there are no thermos in this puzzle. The circles in Row 5 Columns 1 and 9 represent odd digits.

Puzzle link: https://f-puzzles.com/?id=yz65z8hk