159 Buttons
by FullDeck and Missing a Few Cards Open on SudokuPad
Heartburn
- Quadruples
- Indexing
- Columnindex
The brief
**Sudoku, Quadruples, Column Indexing** - Standard sudoku rules apply: The digits 1 through 9 appear in every row, column, and box. - Quadruples: Digits in a Quadruple circle must be placed at least once in the four cells touching that circle. - Column Indexing: Digits placed in red cells indicate the position of the corresponding column number in that row.