Tetris The Grand Master

Tetris: The Grand Master is a Tetris brand arcade game by Arika.

Scoring and grades
Here is a more technical description of the scoring formula :

Score = Ceil((Level + Lines)/4 + Drop) x Lines x Combo x Bravo

Where: (source)
 * Level is the current level you are on.
 * Lines is the number of lines you just cleared.
 * Drop is the number of spaces you dropped the piece. The last space your piece falls does not contribute to this, however locking the piece once it has landed will add 1 to the Drop.
 * Combo returns to 1 by default every time a piece does not clear lines. Otherwise, it is :
 * Combo = Combo - 1 + (2 x Lines - 1)
 * Bravo is equal to 4 if this piece has cleared the screen, and otherwise is 1.

When the player surpasses a given score, TGM assigns the player a grade corresponding to the score. As in the game Go, grades are "signed":

To achieve Grand Master rank, the player must reach grade 1 before level 300, grade S4 before level 500, grade S9 before level 999, and level 999 at or 13:30:00.

20G mode
To turn on 20G mode, the precursor to TGM2's Death mode, press ↓↓↓↓ ↓↓↓↓ C B A.