this will help:
ApocalypticMosh Levelbug12 Jul. 18, 2009
This is how to get the impossible badge 1) Pick Virus. 2) Start in Canada, New Zealand, Cuba, Greenland, or Madagascar. Greenland was the one i won with and i think it is the best, and madagascar is the worst. If you do not get there restart. 3) Sell the starting symptoms, if any, and buy sneezing (unless it is what you started with, just keep it). 4) Buy 1-1-1-0 resistances but no transmissions (they trigger closures). 5) Once four countries are infected, sell sneezing to get rid of visibility. 6) Wait until all countries are infected. If Madagascar closes its shipyards or is not infected in 30 days, restart. 7) Buy all four drug resistances AND sneezing, coughing, and vomiting. 8) After a few days, unlock tiers 2-3, (do not buy tier 4 ever!) keeping whatever symptoms it gives you. 9) Buy fever, fatigue, diarrhea, pulmonary edema, and hypersensitivity. Then save for kidney failure and ataxia. then buy whatever u can.
 "Zombies! Apocalypse - MMO Zombies Massacre"){kind=icon}
 "Bank Shooter"){kind=icon}
 "Password Pl0x V.2"){kind=icon}
 "The Password Game"){kind=icon}
 "Billy's Big Adventure 2"){kind=icon}
 "Pyro II"){kind=icon}
 "Avoid Maze Game"){kind=icon}
 "Ragdoll Cannon 1.5"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Age of War"){kind=icon}
 "Red Remover"){kind=icon}
 "Platform Racing 2"){kind=icon}