Normal sudoku rules apply. Each row, column, and 9-cell region must contain the digits 1–9 exactly once. Regions consist of 9 orthogonally connected cells. Cages within the same region must have the same total (without repeating digits within a cage). Digits within a cage must be all odd or all even. A cage cannot cross region borders. Each region must contain at least two cages. Cages marked with X and Y have different totals. A white dot separates consecutive digits. A black dot indicates one digit is double the other. Not all possible dots are necessarily given.