The frequent pop-ups asking me to announce my level-ups are f'ing annoying. It's one thing to try to make money off of microtransactions, but when you're so BLATANT about it, it takes the fun out of the experience of playing.
It's not that bad, you just have to build a horizontal base on which to start completing lines. Well, that, and to be careful not to bump something you don't mean to. Btw, you can sometimes straighten out crooked pieces by ramming them horizontally with your falling piece.
 "Mebas"){kind=icon}
 "Hell Tetris"){kind=icon}