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While the simulation itself is quite addictive and fun to play, the upgrade system uses far more coins than stipulated. Example: initial Hunter upgrade is 40 coins but places the User in -60 debt. Other than this annoying problem, the game itself is quite fun :) I changed the rating down due to the amount of adverts flooded into the simulator - while important for marketing, the amount and frequency of these adverts is far more than any other iOS game and interferes drastically with game-play