Logic Masters Deutschland e.V.

Welcome to Clue Boxes! I came up with this Sudoku series based on wooden puzzle boxes, where one small discovery leads to the next. Each puzzle works in a similar way: follow the clues, unlock the next step and see where they take you.

Rules:

Normal sudoku rules apply

Fog: All but one of the puzzle boxes are closed 'fog'. Fill in the correct numbers for the boxes to open.

Zipper lines: Digits an equal distance away from the center of a red zipper line sum to the value in the centre of the line (marked with a circle). For even length zipper lines this will be the sum of the two center cells

Killer cages: Digits in a cage sum to the small clue in the cage's top-left corner. Digits may not repeat within a cage.

Global Modulo-3: Each 2x2 box in a grid must contain a digit from each modulo 3 set: {1,4,7}, {2,5,8} and {3,6,9}.

Click the image to play

Enjoyed this one? See the other puzzles in the Clue Box series:
Clue Box #1: a Renban German Whisper puzzle.
Clue Box #2: a Regional Sum Dutch Whisper puzzle.