Logic Masters Deutschland e.V.

Sticks And Boxes

I was inspired by @PotatoHead21's puzzle that showcases a geometric fact about any anti-knight Sudoku. I realized that a more general version of that fact is true for Sudoku X, which gave birth to the puzzle below. If you have not attempted @PotatoHead21's puzzle, the difficulty is probably 4/5 or above. Otherwise, the difficulty should be 3/5 at best.

Rules:

Normal Sudoku rules apply. Digits cannot repeat on the marked diagonals. In cages, digits must add to the number in its top-left corner. On thermometers, digits must increase from the bulb end.

Try it here.

Puzzle: