This game is played on the PC where players use arrow keys to control a white blood cell at the bottom of the screen. There will be red blood cells and viruses sliding down the screen and the speed increases as the player progresses through the game. You can only miss and let a certain amount of viruses through before the human gets too sick and then game over. Players will also need to dodge red blood cells at the same time and if they collide with any, then it will slow down your movement as it lowers the oxygen delivered. Sometimes the Virus can be attached to red blood cells and the player will have to collide with the virus without touching the red blood cell.This game has no end and the goal is to reach and complete as many stages as possible without making your host sick.

Image used:

http://www.newhealthadvisor.com/images/1HT00352/low%20red%20blood%20cell%20count.jpeg