Zip-Fog-Fog-Zip
- Fog of war
- Killer cages
- Kropki dots
The brief
- Normal Sudoku rules apply.
- The grid is partially covered with fog. Correctly placed digits will clear the fog around that cell. No guessing is required.
- THERE IS ONE, AND ONLY ONE, purple Zipper Line, along which each pair of digits that are the same distance from the line's central cell (indicated by a filled purple circle), must sum to the digit in that central cell.
- Digits in a cage do not repeat and sum to the clue in the top left, if given.
- A white dot between cells indicates cells with consecutive values. Not all dots are given.