This has to be the absolute worst thing you could have added to tetris battle. There are already so many pop ups and ads everywhere that I've marginally tolerated. I'm actually embarrassed to recommend this game to other people because of it. But now that there are random ads that pop up between games is actually horrible. Even worse, they introduce more bugs. I just won first place in 6p mode, had a 30 second ad that froze at the end. I reloaded the page, and instead of winning 1.5 stars, I lost them.
I have no interest in playing a game with annoying ads that I'm forced to watch inbetween games, especially if they cause me to lose hard earned stars.