Out of Reach
- Quadruples
The brief
- Normal sudoku rules apply, i.e. each row, column and 3x3 box has to contain the digits from 1 to 9 once each.
- Minmax Quads: Digits in a circle must appear in one of the four surrounding cells and either be the lowest or the highest digit in these four cells. (If there is no conflict with other rules, digits around a quad clue may repeat. In particular, the minimum and maximum may appear more than once.)