Logic Masters Deutschland e.V.

Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.

Renban: digits on a purple line must form a set of non-repeating consecutive digits in any order.

Dutch Whispers: adjacent digits along an orange line must have a difference of at least 4.

Arrows: digits along a thin grey line must sum to the value in the attached circle.

Sandwich variant: the clues outside the grid show the sum of the digits between the 1 and the 9 in the indicated row or column. IN ADDITION, they show the sum of the digits between the first instance of each of 1 and 9 along the indicated diagonals, as seen from the clue.

Play in SudokuPad