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An I-Block (Also sometimes called a Line Piece or I-tetronimo) is a tetrimino that is four blocks in a straight line, and is the main protagonist of the game. Therefore, it has the dimensions one Mino by four Minoes. If rotated either way, the I-block will change orientations from vertical (1x4) to horizontal (4x1), and vice versa. The I-Block is a unique piece as it is the only tetromino that can cause a Tetris. However, it is consistant to come in-game and thus must not be wasted.