1)Pick Virus. 2)Start in New Zealand, Greenland, or Cuba (It's better with Cuba) . 3)Sell starting symptoms, if any, and buy sneezing (unless it is what you started with, just keep it). 4)Buy 1-1-1-1 resistances but no transmissions (they trigger infections). 5) Once nine countries are infected, sell sneezing to get rid of visibility. 6)Wait until all countries are infected. If Madagascar closes its shipyards and is not infected in 30 days, restart. 7)Buy all five drug resistances, sneezing, coughing, and fever. 8)After a few days, unlock tiers 2-3, keeping whatever symptoms it gives you. 9)Buy fever, fudge, diarrhea, pulmonary edema, and hypersensitivity. 10): Wait until everyone dies. keep this comment alive.
There should be breaking news that help your virus, like: People started self-medicating, then your virus gets certain amount of resistance. Or: (Animal) meat has gotten infected by new disease, people will start dying from hunger.
It's so damn difficult, I had to dodge the boss' ninja shurikens while doing the Matrix on a wall, I, somehow managed to grab the fire magic power and cast a power that made a giant tower fall over him.