Normal sudoku rules apply. In the finished grid, every cell will be part of a group of orthogonally connected cells that share the same parity (ie an odd or even group comprising every orthogonally connected cell of the same parity). Such a parity group can be as small as a single cell, or large enough to span multiple boxes and include repeating digits. Corner clues give the sum of all cells in the parity group containing that cell. Black dots separate cells with a 1:2 ratio. Not all possible black dots are given.