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Easy as LITS (353)
Instruction:
Shade exactly four connected cells in each outlined region to form a tetromino, so that the following conditions are true: (1) All tetrominoes are connected into one large shape along their edges; (2) No 2×2 group of cells can be entirely shaded; (3) When two tetrominoes share an edge, they must not be of the same shape, regardless of rotations or reflections. (Each tetromino, based on its shape, looks like the letter “L”, “I”, “T”, or “S” or their reflection. Not all four letters have to be present in the grid; for example, it is possible for your solution to not have any “I” shapes.)
The letters outside the grid indicate the shape of the first tetromino that can be seen in the respective row or column from the respective direction.
Cells with an ‘X’ (if given) are not part of any region.