I change my mind. It is impossible to select "L" to return to the level select due to it's closeness to the edge of the screen, and I don't appreciate the forced ads.
Scaling problem. I had a quarter screen and tried to back out after a while. Then it resized but didn't register taps fast enough to play. Oh, work on your engrish too.
use the bonus (fill all of the input boxes) when you have filled the bonus bar. That will remove a row of accumulated blocks.