Logic Masters Deutschland e.V.

Normal Sudoku rules apply.

STONE SANDWICHES
- The value of a square outside the grid is the sum of the cells between the first two stones it sees in that row or column.

KROPKI STONES
- Values orthogonally on either side of a white stone differ by exactly N, where N is the digit on the stone.
- Values orthogonally on either side of a black stone have a 1 to N ratio, where N is the digit on the stone.