Having to figure out how you can demolish all pigs with one shot ia fun. But how the hell do you earn 25000 pearls for a hat! 90 is a hell lot of levels in Tower, loosing all rewards is highly frustrating , there is no skill involved! Given that it is the only way to get high tier hats. Rovio, you can add a save and exit option at level 30 and 60, getting frustrated results in wanting to leave the game or stop playing. Number of birds are too less in Eagle boot camp, takes 4 months to buy a hat