1) Pick Virus.
2) Start in Canada, Greenland, New Zealand, Russia, or Cuba (if not, restart).
3) Sell starting symptoms (if any), other than sneezing. If you don’t have sneezing, buy it.
4) Buy 1-1-1-0 Resistances.
5) Once your disease spreads to about 10 countries, sell sneezing to get rid of visibility.
6) Wait until all countries are infected. If this is after day 30, restart.
7) Pump 4 Drug Resistance and buy sneezing, coughing, vomiting.
8) After a few days(at latest around 35), unlock tier 2-3 keeping whatever symptoms it gives you.
9) Buy fever, fatigue, diarrhea, pulmonary edema, hypersensitivity, hemorrhaging and whatever else you can afford that increases lethality.
10) Wait until everyone dies. If you have extra points, unlock tier 4. (unlikely) This works, it won me everything.
I dont kno if this works well but im trying to get the impossible badge by following this "guide"