Logic Masters Deutschland e.V.

Normal sudoku rules apply. Cells separated by a knight's move cannot contain repeated digits.

Place nine row-indexing and nine column-indexing cells into the grid, one in each row, column, and 3x3 region. Row- and column-indexing cells can overlap. In addition to the usual indexing rules, row-indexing cells index the location of column-indexing cells and vice versa. (Full indexing rules and example are provided in the link.)

Practice puzzle

Play on SudokuPad