“Prevent Infection” is a game that tests the user’s reaction and memory. You need to keep in mind the complex properties of various agents, and choose effective drugs among high-speed rolling drugs to eliminate the virus. Each virus has a different health value. In “Easy” mode you only need to remember the first property of the potion. In “Difficult” mode you need to kill 2 viruses at the same time. Each drug has different effects on the left and right viruses. You need to kill the virus in a limited time by precise calculations.