There are two simple strategies... 1) The first strategy is never to split -- stay large and use the fast power-up to eat your enemies. 2) The second stategy is to avoid viruses and your enemies will eventually get affected and die. If this helps then copy/paste.
This time, use the all new towers and upgrades to work your way through all new tracks and 3 difficulty modes to achieve that total Bloon popping satisfaction.
Where are the achievements?!
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) Pump 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, hemorrhaging 10) Wait until everyone dies IT WORKS!!!!!! COPY AND PASTE IF IT WORK FOR YOU.