This game is amazing especially you love your penguins. Being a penguin lover, I have been playing for 3 months and still playing. The ads is placed correctly, only shows when you click on it (like whaling/treasure boat, treasure box and collect chest and gem). While it is worth playing, the effort of playing become harder and harder. I have spent a long time to unlock to Whale Nest, and i believe the next one will even take a lot longer. This probably the only downsize. And if you never intend to spend money, you will not able to finish the event. Further, when start to create "artificial" penguins or animal not available in antartica, it become harder to explain to kids that moose/polar bear only live in the artic.