Logic Masters Deutschland e.V.

Normal Sudoku rules: Each row, column and 3x3 box must contain the digits 1-9 once only.

Normal Knight's constraint: Cells that are a chess Knight's move apart from each other cannot contain the same digit.

Normal Arrows: Digits along arrow paths must sum to the total in their circle.

Normal Thermometers: Digits along the thick grey line must increase from the bulb (circle) end of the line.

Normal Little Killer clues: A number outside the grid indicates the sum of the digits along its diagonal.

f-puzzles: https://f-puzzles.com/?id=yazzecmg

CtC: https://tinyurl.com/3xw7afhj