A way to get the hard badge:
Level 1, 3, 4, 6-13 and 16: 100 %
Level 2: 80 %
Level 5: 92 %
Level 14: 31 %
Level 15: 30 %
Level 17: 33 %
Level 18: 65 %
Level 19: 92 %
Level 20: 32 %
Gives a total of 1655 %
Thanks for the tip for level 16 (slice the blue thin close to the black and wait). I kept opening the game in a new window and tried for it untill 1 of them succeeded. Opened 18 and number 12 succeeded.
The tactics below work. Cheers to whomever posted it. something like 75-80 days. started in Cuba.1) Pick Virus. 2) Start in Canada, Greenland, New Zealand, 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 a few countries, sell sneezing to get rid of visibility. 6) Wait until all countries are infected. If Madagascar closes or this is after day 30, restart. 7) Buy all 4 Drug Resistance and buy sneezing, coughing, vomiting. 8) After a few days, unlock tier 2-3 keeping whatever symptoms it gives you. 9) Buy fever, fatigue, diarrhea, pulmonary edema, hypersensitivity, and hemorrhaging. 10) Wait until everyone dies. copy and paste if it worked for you.
 "3 Slices 2"){kind=icon}
 "This is the Only Level"){kind=icon}
 "Pandemic 2"){kind=icon}
 "Dino Run"){kind=icon}
 "Vector Runner"){kind=icon}