Players take on the role of the heroic Dr. Jim Jack, who must fight to prevent the evil Mr. Joke and his germ legion from spreading a super virus. Joke is on a rampage after being rejected by medical schools, and wants to prove his abilities by creating an incurable plague. Luckily, his old friend Dr. Jim Jack has the skills to stop him.
To stop Joke's virus players must jump inside the bodies of the infected and become the cures - using intuitive touch controls to connect 3 or more matching cells to create cell-soldiers. As Joke's virus mutates and grows stronger, Dr. Jim Jack will need to constantly adapt his vaccine, keeping it effective and efficient enough to cure every infected patient.