Logic Masters Deutschland e.V.

Rules:

Normal sudoku rules apply. Place the digits 1 to 9 in each Row, Column, and 3X3 box.

X-Sums: Clues outside the grid give the sum of the first X digits in their respective row or column, where X is the digit nearest the clue.

German Whisper: Adjacent digits along a green German Whispers line must have a difference of at least 5.

X clues: Cells separated by X must sum to 10. Not all X's are necessarily given.

Fog of war: The grid is covered in fog. Placing the correct digits reveals cells in the surrounding 3x3 area.

Solve online: CTC