Logic Masters Deutschland e.V.

Normal Sudoku rules: Every row, column and box must contain the digits 1-9

Normal Kropki rules, no negative constraint: A pair of cells joined by a white dot must be consecutive. A pair of cells joined by a black dot must be in a ratio 2:1. Not all dots are necessarily given.

Normal Equal Sums rules: For each line, digits on the line have an equal sum N within each box the line passes through.

f-puzzles: https://f-puzzles.com/?id=y7fc4nst

CtC: https://tinyurl.com/a4cdkd2m