Logic Masters Deutschland e.V.

Normal sudoku rules apply:

- every row, column and 3x3 box must contain digits 1-9 exactly once

additionally:

XV rules:

- All orthogonaly adjacent cells separated by V sum to 5, all V clues are given (negative constraint apply)

-All horizontally adjacent cells separated by X sum to 10 (negative X constraint apply only horizontally)

Kropki rules:

-All vertically adjacent cells separated by black dot have a ratio 1:2 (negative black dot constraint apply only vertically)

- cells separated by white dot have difference of 1 (consecutive), only white dots laying on thick line between boxes are given

F-puzzles