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.

German Whispers: Adjacent digits on a green line must have a difference of at least 5.

​Example: In this puzzle, the seventh and eighth cells in Box 1 are inside the cage of sum 12. This means that the sum of the digits in cells R3C1 and R3C2 is 12. Furthermore, the sum of the digits in the seventh and eighth cells of the Tenth Box (R8C2 and R8C5) is also 12.

Example: In this puzzle, the first and second cells in Box 1 are connected by a German Whispers Line. This means that the digits in R1C1 and R1C2 differs by at least 5. Furthermore, the first and second cells of the Tenth Box (R2C2 and R2C5) differs by at least 5.

Solve on Sudokupad