at first it was a little akward getting used to....after that it's smooth sailing.
on left/right side of the screen, touch control for moving pieces left/right and rotate (the rotate is available on each side of the screen)
on the bottom of the screen, touch control for speeding up the fall rate
touching the top of the tetris border drops the pieces in place
it's actually not a bad remake of the game, because the controls work with touch, so you don't have to press down on the screen to confirm. fluidity is ok most of the time (responsiveness). once in a blue moon there's a hiccup and a touch doesn't register, but i think that's attributable to having your finger too close to another control at the same time.