To earn stars you have to care for your animals. The better their feeling the more stars their you get. To get extra stars try to get awards. Different awards give you different amount of stars. You can also do challenges. If you do well you can also get stars.
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Many games have cheat codes to achieve missions faster. If you cannot find any cheat codes for Zoo Empire, advertise your animals in shows and as stuffed toys in shops and wait for them to get popular and gain stars.