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Tapa (Wall) (924)
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 can be shaded black.
There are some "walls" (highlighted edges) given in the grid. Exactly one of the two cells connected to the wall must be black.