Click Green flag. After you press start, use the mouse to hit the dark blue malaria parasites. If the parasites knock out all the red blood cells in the current frame then you lose health. Accidentally hitting a white blood cell also costs health.
This game is not the best/kind of buggy. Still working on it Also, it only goes to a level 3 I got the idea from the flash game "Sepsis"- http://www.newgrounds.com/portal/view/382253
