Game has full on commercials, not ads! Low levels have 10 differences to find; higher levels (I think it started at level 500) have only 5 differences with 15-30 second commercials between each. So you're spending far more time on ads than game play. There are ads at the bottom of the screen throughout game play plus long commercials in between each level. I totally accept ads are how developers monetize their game but the length of individual ads is what broke me. Uninstalling.