Logic Masters Deutschland e.V.

Dynamic Fog: Placing correct digits may clear up fog somewhere in the grid. No guessing required.

Normal Sudoku rules apply. Place the digits such that every row, column and 3 by 3 box contains the digits from 1-9 only once.

Kropki Dots: Digits separated by a black dot has a 1:2 ratio. (One is double the other)

Green Whispers Line: Adjacent Digits along a green whispers line differs by at least 5.

Orange Lines: Digits on the same orange line has the same number of letters when spelled. (For example, 4 and 9 may lie on the same orange line since both FOUR and NINE have four letters)