Window Pane
by FullDeck and Missing a Few Cards Open on SudokuPad
Indigestion
- Zipper lines
- Little killers
The brief
Normal Sudoku rules apply: every row, column and 3x3 box contains a complete set of the digits 1-9. Zipper lines: Along Zipper lines, pairs of digits equidistant from the center of the line have the same sum. For Zipper lines of odd length, that sum is the central digit on the line. Little killers: Clues outside the grid give the sum of the digits along the indicated diagonal.