Tapa is a logic puzzle. The goal is to blacken some cells of the grid.Shade some empty cells black to create a single connected wall. Numbers in a cell indicate the length of consecutive shaded blocks in the neighboring cells. 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. Cells with numbers cannot be shaded, and the shaded cells cannot form a 2×2 square anywhere in the grid. Question marks can be used instead of clue numbers. Each question mark can represent any nonzero integer.