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Graffiti (536)
Instruction:
Blacken some cells in the grid and draw a closed loop through all other cells in the grid. The loop connects the centers of cells orthogonally, and never goes through a cell more than once. Some rows have number clues next to them. The numbers represent, in left-to-right order, the exact size of groups of consecutive black cells in those rows. Groups are separated by at least one non-blackened cell. As a special case, if the clue ‘0’ is given, it means there are no blackened cells in that row. Similar clues may be given for some columns (using top-to-bottom order).