I found the game incredibly fun when I was selectively trying to evolve the disease to spread across the world, infect birds and livestock, make it spreadable by saliva in time for the “kissing festivals”, and, once it was detected, trying to speed things up fast enough to disrupt research on the cure by killing enough people or using clever mutations that affected the way people work.
Then I discovered that the only effective strategy in harder levels is to nothing at all and de-evolve any mutations, and just sit and wait for an hour until every country was infected.
Then it stopped being as fun.
(Note: I got bored once I discovered this strategy on level 3 (fungus?) and stopped. Maybe it gets fun again later?)
