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Tetromino Search (551)
Instruction:
Locate some tetrominoes in the grid. Each piece of a tetromino occupies a single cell. Cells marked with crosses cannot contain a piece of a tetromino. Tetrominoes do not touch each other, not even diagonally (that is, if two tetromino pieces are in adjacent cells, they must be part of the same tetromino).
Each number to the left and top of the grid reveals the number of tetromino pieces that must be located in that row or column.