Logic Masters Deutschland e.V.

Rules:

Normal Sudoku rules apply. Place the digits 1-9 once each in every row, column and 3x3 box.

Normal Variant rules apply.

German Whisper - consecutive digits on green lines must differ by 5 or more.

Palindrome - digits on grey lines repeat forward to backward, e.g. 123321

Kropki Dots - digits on black dots are a 2:1 ratio

Positive Diagonal - digits may not repeat on the blue diagonal line.

Links:

Play with SudokuPad