Rules: Divide the grid into pentominoes such that every cell in the grid is a part of a pentomino. Pentominoes of the same shape (rotations and reflections of a pentomino count as the same shape) cannot touch each other along an edge, but they may touch diagonally. The cells separated by any given circle belong to different pentomino shapes. Furthermore, If each cell is numbered based on the number of adjacent cells belonging to the same shape that it belongs to, a given white circle separates two equal numbers and a given black circle separates two unequal numbers.
About: Expansibility was invented by Anurag Sahay
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