Adblock prevents the ads from playing in the browser version and they are all optional anyway. I loaded the game in the app to see if they worked the same as the ones in their other games, like Rise of Cultures, and they do. There is the one for random rewards, I got lucky with the one I watched and got 18 diamonds, and there are ones to watch to heal troops after a fight, and there are the ones in the Builder's Hut that boost a production you choose before starting the ads. A max of 5 is available to get a 12-hour boost and the boost can be +20% mana or seeds production or +80% of a boosted goods production, among others. Once you are in chapter 18+, using this for a 12-hour +80% to a boosted ascended goods production may make me load the game once a day in the app just to deal with the 5 ads.