one remark (not so important) to help you : on the last screen of the tutorial (id. ruler/economy/etc), if you click two times in a row on "economy" and "military", everything disappears, and you just end in reloading the game.
There's still sometimes a few glitches (such as being stuck in the obstacles without being able to move further). Nonetheless, an overall fine game, easy and refreshing.
1)Pick Virus. 2)Start in Canada, New Zealand, Cuba, Greenland, or Madagascar.If you do not get there restart. 3)Sell starting symptoms, if any, and buy sneezing. 4)Buy 1-1-1-0 resistances and all transmissions. 5) Once three 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, sneezing, coughing, and vomiting. 8)After a few days, unlock tiers 2-3, keeping whatever symptoms it gives you. 9)Buy fever, fatigue, diarrhea, pulmonary edema, and hypersensitivity. 10) Wait until everyone dies Repost this guide to let it live