Many bugs, like tiles in your rack going on top of each other so you can't see all of them. App often crashes. Huge battery drain, even while plugged in. Too many ads, some of which don't have an X, so the only way to get back to the game is to quit the app and reopen it, sometimes after every move. The app startup is always slow to load, even with a fresh install. Friend list has ppl I never added, and no way to remove them. Ad-free version is $13 per month or $63 per year; that's unreasonable.