this is my guide:
1- pick disease type (virus, infection, bacteria)
2- unselect (sell) any symptom and any transmision way.
your disease will be completly stealth.
3- upgrade cold-heat-moisture lo lvl 2 and then drugs 'till lvl 4
now patience my young padawan...
4- wait 'till every (i mean every) country gets infected. if anyone closes both airport and shipyards without being infected, you will need to restart.
5- upgrade every transmision way and make your disease as fatal as posible.
6- good luck! you might need to try several times (maybe 15 times...)
the trick is to put the orbs in line, upgrade the jewels with points, and also the fireblast. so far, it's unnecesary to upgrade orbs ingame. it's pretty repetitive, but nice-
how do yo start a game? or is it that can only be played with 4 players? cause i'm trying to play against somebody else but there is no start button... and i made the server
help :S