Gameplay
The basic gameplay of TGM is similar to that of other Tetris games. The player must move and rotate Tetrimino-shaped pieces falling into a well to form horizontal lines, which will then be cleared. During gameplay, the game automatically gives ranks (or 'grades') to the player according to his/her score, starting from 9 all the way up to GM (Grand Master).
Read more about this topic: Tetris: The Grand Master