A battle between a healthy virus (blue) and a unhealthy virus (red) to get the most bacteria cells flying around (orange).
Blue virus: The blue virus is trying to get the most cells to "throw away" or "clean". When it gets a cell, it grows and gets a point to the scoreboard.
Red virus: The red virus is trying to grow the most by containing all the bacteria cells before the blue virus does. When it gets a cell, it grows.
Mostly each round is different each time.