Quadkropter

**Standard Sudoku, Quadruples, Kropki pairs** - 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. - Kropki pairs: Digits in cells separated by a black dot are in a 2:1 ratio. Digits in cells separated by a white dot are consecutive. Subscribe to our mailing list to receive a weekly email with all of our puzzles from the previous week: https://missingdeck.net/mailing.html