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.

Renban: Digits on a pink Renban line forms a set of consecutive digits, in some order.

​Example: In this puzzle, the eighth and ninth cells in Box 2 are inside the cage of sum 9. This means that the sum of the digits in cells R3C5 and R3C6 is 9. Furthermore, the sum of the digits in the eighth and ninth cells of the Tenth Box (R8C5 and R8C8) is also 9.

Example: In this puzzle, a pink renban contains the fifth and sixth cells of Box 2. This means that the digits in R2C5 and R2C6 forms a set of consecutive digits. Furthermore, the fifth and sixth cells of the Tenth Box (R5C5 and R5C8) also forms a set of consecutive digits.

Solve on Sudokupad

Need help with the rules? Check out this video breakdown by Joe Ballew .