Made it through the first section of the journey (tropical jungle) just fine without having to pay. Ads were fine for the amount of play time. By half way through the 2nd section of the journey (coral sea) you have to pay for wild cards to pass the phase. After 10 rounds of area 18 I'm just deleting the app. I don't want to literally pay to cheat and pass phases. Also, there are parts that just don't make sense: what are the coins for? What are the pets? The FAQ doesn't help either. Lame.