Logic Masters Deutschland e.V.

Sissa's Lines by Patrick Junke

Rules:

The standard Sudoku rules apply: place the digits 1–9 exactly once in each row, column, and 3×3 box.

Each line has a beginning and an end, neither of which is indicated.

Each cell on a line has an associated value. Starting from the beginning of a line, each cell's value is twice that of the previous cell.

The digit in each cell on a line is the digital root of its value: repeatedly add its digits together until a single digit from 1 to 9 remains.

For example, a cell with value 32 contains 5 (3 + 2 = 5). The next cell has value 64 and therefore contains 1 (6 + 4 = 10 → 1 + 0 = 1).

On each line, exactly one cell match its value.

Here is a link to a SudokuPad version of the grid.