Place the digits 1–9 exactly once in each row and each column. Shade some cells so that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2×2 area is entirely shaded or entirely unshaded. Within each cage, the sum of the shaded digits equals the sum of the unshaded digits. Digits MAY repeat within a cage. The corner cells with grey diamonds contain the same digit.