Indextension

Normal sudoku rules apply.

INDEX LINES: The value of the Nth cell along a line (starting from the diamond) indicates the position along the line of the cell which has the value N. Eg: if the first cell along a line has a value of 3, then the 3rd cell along that line has a value of 1. The value of a cell always equals its digit UNLESS it is a pseudo cell.

PSEUDO CELLS: Every row, column and box contains exactly one pseudo cell, and every pseudo cell contains a different digit. The value of a pseudo cell equals its row number plus its column number, regardless of which digit appears in the cell.