Foggy Oil and Water
- Fog of war
- Killer cages
- Oil and water cages
The brief
Normal sudoku rules apply.
Each cage is either full of "oil" (even digits), full of "water" (odd digits), or a mix of both. In all cases, each "row" within a cage is of just one type (oil or water). Oil floats on water, so even digits will always be in rows above odd digits in mixed cages.
Digits in cages do not repeat.
Digits in cages must sum to the small clue, if given.
The grid is partially covered in fog. Placing correct digits will clear the fog from surrounding cells, possibly revealing more clues.