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Paint by Numbers (528)
Other names: Nonogram
Instruction:
Blacken some cells in the grid such that the numbers to the left of (and above) the main grid represent the lengths of contiguous blackened cell blocks in the corresponding row (or column). The lengths are given in order from left to right (or top to bottom), and cell blocks must contain at least one unblackened cell between them. As a special case, if the single clue "0" is given, it means there should be no blackened cells in that row (or column).