A virus is taking over and you are the only one who can stop it. This game uses a game board with gray circles. A few green and red circles start out in opposite corners. The red circles are the virus, and they multiply much more quickly than the green circles. You have to eradicate the red circles and take over the board with your green circles. To do this, click on green circles to change the direction of their arrows. They will spread from there and turn any circles they run into green. However, the red ones will be doing the same, so you have to think on your feet.