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Tapa (Unknowns) (759)
Other names: Tapa with questionmarks
Instruction:
Shade some empty cells black; cells with numbers cannot be shaded. All black cells connect along edges to create a single connected region. (It is permissible for the region to touch itself at a corner, but touching at a corner does not connect the region.) No 2×2 group of squares can be entirely shaded black.
Numbers in a cell indicate the lengths of contiguous black cell groups along the "ring" of (up to) 8 cells touching that cell. (If there is more than one number in a cell, then there must be at least one white (unshaded) cell between the black cell groups.) The numbers are given in no particular order. As a special case, if the number given in a cell is a zero (0), it means that none of the cells around that cell may be shaded black.
Some numbers have been replaced with question marks ('?'). Ignore the arrangment of numbers; for example, a "? 2" could be a "1 2", "2 2", or "3 2". If there is more than one number or question mark in a cell, none of them can be zero (0).