Diagonal Index Puzzle
- Diagonals
- Whisper lines
The brief
Standard sudoku rules apply: each row, column, and 3x3 box must contain all the digits from 1 to 9.
Green lines are German whispers lines: consecutive digits along a line must have a difference of at least 5.
The marked diagonal must have no repeat digits. In addition, the diagonal is an index line: a digit on the line gives the row in which the column number appears, and the column in which the row number appears. E.g. if R1C9 were 4, then R4C9=1 and R1C4=9.