Circling the Wagons

**Sudoku, Quadruples** -Standard 9x9 sudoku: The digits 1 through 9 appear in every row, column, and box without repetition. - Quadruples: Digits in a quadruple circle must be placed at least once in the four cells touching that circle. If a digit appears twice in a quadruple circle, it must be placed twice in the four cells touching that circle. For more of our puzzles, please visit https://missingdeck.net or join our mailing list to get a weekly digest of puzzles: missingdeck.net/mailing