As everyone else has said, ads are constant, which IS frustrating. Many are not optional. Separately, the gameplay is quite repetitive, with repeating collection of resources. Exploration & its design are actually fun, but slowed down by ads and constant rising demands for resource collecting. That said, I did play through all the content currently available and was kept motivated to keep moving forward. The whole thing took me 4 days. Some people will enjoy it, others will find it aggravating.