I did it, I'm officially a Tetris Master, my heart is beating so fast that it would count as Impossible Mode on Bio-Tetris for Tetris 64* [Tetris Ultimate for Nintendo 3DS] *Japan-only :
So apparently you can beat tetris ds : r/Tetris
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So Tetris ds just stop counting when you hit 999 lines, but your score and level are still going on. : r/Tetris