Height level:

• As Tetris DX does not have a hard-drop mechanic, save time by using higher height-lvls. This reduces the distance bricks need to travel by soft drop before getting placed. Preferably, use height lvl 5 in 40-line mode.
• The 100-line category is played in Marathon-mode, which does not effer preset height lvls. Instead, you can simulate higher height lvls by building a thick bottom layer of gibberish at the start of your attempt.

Animations when clearing lines

• Line-clear-animation takes time. To reduce time, trigger this animation the fewest times possible by clearing more lines at once, preferably the 'tetris' (4 lines cleared at once)