Watched the ads, lost the rewards. Waste of time. Do not install. Before expanding to the 3rd area I had watched a handful of ads to give be better collection speed and inventory space... they functioned fine for about 4 minutes. Than an ad randomly started and turned my screen black, then eventually turned off my phone for inactivity. the game removed them after the ad failed to load... so I was on the 3rd area with no upgrades dispite putting my time into the game. Such a waste of effort.