Dutch Flat Mates (Sharing Cages)
- Killer cages
- Dutch flat mates
- Flat mates
The brief
- Normal sudoku rules apply, i.e. each row, column and 3x3 region has to contain the digits from 1 to 9 once each.
- Dutch Flat Mates: Each 5 in the grid either has a 1 directly above or a 9 directly below it. (It may have both, but it does not need both.)
- Killer cages: Digits in a cage sum to the clue in the top left. Moreover, if cages are adjacent to each other (i.e. share an edge), they have to contain at least one common digit.