Tetris: The Grand Master series
Group DescriptionAn official Tetris sub-series distinguished by its unique set of gameplay rules and goals. These games challenge players to reach the highest level possible in the shortest amount of time. Players are awarded rankings based on how well they play, and the ultimate goal is to achieve the elusive Grand Master rank. The series is notable for introducing 20G, a state in which the tetrominoes do not fall, but instead immediately appear at the bottom of the screen, where they must be rotated and pushed into the desired position within a fraction of a second.
Screenshot from Tetris: The Grand Master
Screenshot from Tetris the Absolute: The Grand Master 2