Nullpomino - Speed Mania (GM Grade)
After finishing Master mode on Tetris Axis (3DS) This one was way easier for me.
This is played with SRS rules
This mode is about breaking the barrier of 3:25.00
So you've to play fast at first and then it become a survival play.
Hardest part is to not do misdrop and stuff.
You get no grade for completing lvl 500 above 3:25.00 (Game stop)
You get M for completing lvl 500 under 3:25.00
And GM for whole levels.
Taken from Tetris wikia
T.A. Death mode is identical to Master Mode in gameplay, but the game begins and remains at 20g throughout (similarly to the 20g Mode code). However, how quickly a tetromino is given out, how quickly a tetromino will lock into place, and other values that determine the speed of play steadily change as levels are cleared.
T.A. Death is possibly the most famous mode ever featured in a TGM game. A video originally called Death 800, which features a player breaking level 800, has floated around the Internet under the name Tetris Japan Finals, making the TGM series famous throughout the world. This video is very popular and was singlehandedly responsible for introducing most western players to the TGM series. (People with a recent version of Flash Player can view this video on YouTube.) Arika currently hosts a much better Gm rank Death Mode video: Death-Gm05.
Ranking
Only the M and Gm grades are achievable. The conditions are as follows:
If the player reaches 500 with a time greater than 3:25:00 the timer will stop, the credits will roll and the player is given an "Excellent!" but no grade.
If the player reaches 500 under (or equal to) 3:25:00, the M grade is given and the game will continue to 999.
Gm is awarded at 999 regardless of time or score. The game does continue through the credits, but winning or losing at that point has no effect.