Logic Masters Deutschland e.V.

Rules:

Normal Sudoku: Fill the grid with digits 1–9 such that every row, column, and 3 by 3 box contains each digit exactly once.

The Tenth Box: The nine center cells of the standard 3 by 3 boxes form a "Tenth Box" which must also contain the digits 1–9 without repetition.

Any rule or constraint in a standard 3 by 3 box is applied to the corresponding cells in the Tenth Box. Constraints map from the nine standard boxes to the Tenth Box, but not vice-versa.

Killer Cages: Digits in a cage must sum to the value in the top-left corner. Digits cannot repeat within a cage.

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

​Example: In this puzzle, the seventh and eighth cells in Box 1 are inside the cage of sum 7. This means that the sum of the digits in cells R3C1 and R3C2 is 7. Furthermore, the sum of the digits in the seventh and eighth cells of the Tenth Box (R8C2 and R8C5) is also 7.

Example: In this puzzle, the first and second cells in Box 2 are connected by a Dutch Whispers Line. This means that the digits in R1C4 and R1C5 differs by at least 4. Furthermore, the first and second cells of the Tenth Box (R2C2 and R2C5) differs by at least 4.

Solve on Sudokupad

Tenth Box Puzzles:

• 1. The Tenth Box: Unboxing
• 2. The Tenth Box: German Whispers
• 3. The Tenth Box: Renban
• 4. The Tenth Box: Kropki
• 5. The Tenth Box: Dutch Whispers
• 6. The Tenth Box: Killer Cages