Positive Negativity 5
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The brief
Normal Sudoku rules apply, place the digits 1-9 in each row, column, and box.
Yin Yang: shade some cells so that all shaded and unshaded cells form 2 orthogonally connected areas such that no 2x2 area is entirely shaded or unshaded, and all the digits values in the shaded area are negative values for all clues.
Killer Cages: VALUES in cages add up to the total in the corner, and DIGITS may not repeat in a cage.