Classic Tetris is a very popular falling blocks puzzle game. A sequence of tetrominoes - shapes composed of four circle blocks each - fall down the playing field. The object of the game is to manipulate these tetrominoes, by moving each one sideways and rotating it by 90 degree units, with the aim of creating a horizontal line of blocks without gaps. When such a line is created, it disappears, and the blocks above (if any) fall. It has boss key!
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