if you want help on the 100 fast kill go to the gems mode gather all the gems in one place using the browning and keep shooting the zombies with the browning and then change to mini gun before reloading (so you can star with a full clip without having to reload) then start killing with mini gun then browning and so on...
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 "Insectonator: Zombie mode"){kind=icon}
 "Flight"){kind=icon}
 "The Tickler"){kind=icon}
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 "Grid16"){kind=icon}
 "Topsy Turvy"){kind=icon}