Quad Ripples

**Standard Sudoku, Quadruples** - 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. Subscribe to our mailing list to receive a weekly email with all of our puzzles from the previous week: https://missingdeck.net/mailing.html