Divide the grid into polyominoes and fill each cell with a number equal to the size of its polyomino. Polyominoes of the same size may not share an edge. Shade some cells such that all shaded cells are orthogonally connected and all unshaded cells are orthogonally connected. No 2x2 area may be fully shaded or unshaded. All odd polyominoes are shaded, while all even polyominoes are unshaded. Numbers on cells with an arrow indicate the number of polyominoes of the SAME shading/parity seen in the direction of the arrow. Arrows do not count their own cell, but may count their polyomino if a cell within its polyomino is visible in the direction of the arrow.