Logic Masters Deutschland e.V.

In space no one can hear you... whisper. SPOILER: Mark's solve on CTC.

Normal Sudoku rules apply. Each row, column and 3x3 box contains each number from 1 to 9 exactly once.

German Whisper Sudoku rules apply. Two cells connected by a line (either grey or green) must have a difference of five or more between their digits.

The inequality sign between two cells shows which one contains the lower/higher digit.

The puzzle is also available online.