You earn points by killing humans. You can use those points to evolve into a new strain.
Plane icon represnts airports. Airports spreads your virus to other countries when infected people fly to another country.
Water drop icon represnts water facilities. These spread your virus inside a country much faster than normal when they are infected.
Go button starts the simulation. After the simulation has finished a day will have passed and any points will be added.
This Button opens the virus editor window where you can upgrade your virus with points you have earned.