Rules -- Block Band

Block Band was invented by the Japanese puzzle company Nikoli (under the name Mochikoro).

1. Determine whether each cell is white or black according to the following rules.
2. No 2x2 cell area within the grid may contain all black cells.
3. The white cells must all form rectangle-shaped "islands". No two islands may be adjacent horizontally or vertically; however, the islands must all be connected through their corners.
4. No cell with a number in it may be black. Every cell with a number in it must be part of an island containing that many white cells. Every island must contain at most one number (although an island may contain no numbers).

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