Forced to watch ads or given rewards for watching ads.
"There are ads in this game, you can watch them as a reward to keep going, if you say no you watch one anyway with no reward. You have to spend real money for there to be no ads. You can also watch an ad to get a free resurrection"
"One after every single puzzle, without a way to escape them other than restarting the app, which has a slow startup time"
"You can choose to watch advertisements to gain rewards a limited amount of times a day. You will never have an ad forced on you."
"Yes, it isn't as bad because it's chosen advertisement but you can get wishes or gold or crystals if you watch ads and because your wish cap is 3, a lot of the time you'll have to watch ads to get more"