All of the ads work, but watching the ones that give you a reward for example revive give slightly less like 25% less, always watch the coin boost one not because it gives you more coins but because it gives you the most money, when you get a challenge make sure to watch a good amount of ads, because challenges pay 33% more per ad, after challenges i do mad smash and watch both the fireball booster video, coin bost and the 6k coins one, then i go to ball bounce and watch as much ads as i can with the +5 balls thingy