Fill the grid with 9 non-overlapping 3x3 square regions, such that each region contains the digits 1-9 once each and no digit repeats in any row or column. Cells outside regions do not contain digits. The whole 11x11 grid must form a valid “yin yang” grid: ie shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded. Digits in a cage must not repeat. The number in the top left corner indicates either the sum of the digits of the shaded cells or the sum of the digits of the unshaded cells contained within that cage.