The ads are relentless. Usually if you fail to clear a level, you are given an option to either "buy" three extra lines, or, for one line, watch a 30 second ad that tells you if you can put a square peg into the only hole, that's also square, then your are some kind of genius. But if you accidentally select the add 3 line option, then the one line option goes away. Forever. I can't get past a certain level because I'm not doing the three line option again. So, time to uninstall the app.