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Tasquare (326)
Instruction:
Shade some empty (non-numbered) cells black (leaving the other cells white) so that the grid is divided into non-overlapping regions; cells of the same color are considered in the same region if they are adjacent along edges. All white cells are in the same region. All black cells are part of square-shaped regions. Each given number must match the total area of all black regions touching that number’s cell along an edge. Some numbers have been replaced with a question mark ('?'); their value is for you to determine, but cannot be zero (0).