This guide is meant to be taken in a slow and steady approach. This is not signified by the message ' needs to evolve to kill' but rather 'There are no healthy people left in the world.' Lethality will begin to kill the infected, and it should be saved until endgame, where the final goal is to eradicate humanity. Make sure to stay away from Lethality until the whole world is infected. If you always keep severity at 0, you can infect the whole world without triggering the cure. The cure can also be slowed by certain abilities and by destroying the head country working on the Cure. Severity will increase its speed, so be aware of it. Blue bubbles will begin to appear, which you can pop to slow down the speed of the cure. If any amount is present, a doctor will notice the virus and The Cure will begin, which will end the game if it is complete. You want to make sure Severity stays minimal. LETHALITY is to be left for the end-game, as it is how fast the virus will kill. You want to make sure this doesn't rise early on.

SEVERITY determines how fast the Cure is completed (more on that later) and how fast your virus is detected. INFECTIVITY is how fast your virus can spread. There are 3 bars at the bottom of the screen when you open the Disease menu. While the virus spreads, Orange bubbles will appear which give DNA. To Devolve something, do the same, and you will get 2 DNA back (or lose DNA on some plagues). To spend DNA, simply select a hex (the hexagons with a symbol) and click Evolve if you have enough DNA or double click it. 1 and P play at normal speed, 2 doubles the speed, and 3 triples it. You can also increase the speed of the game. DNA is also obtained by infecting and killing people. To open this menu you can click in the bottom left corner or press Q. DNA can be used to buy symptoms, transmissions, and abilities for your plague. When a new country is infected, a red bubble will appear that you can click for DNA. You will indirectly control the plague by evolving it to allow it to spread faster and kill. To begin the game, you must click the red Play button (a red bubble with a white (isosceles) triangle pointing right) that appears where you click. Upon starting, you will select a country. For New PlayersFeel free to skip this section if you already know the basics of the game, as this section is aimed for those that haven't played Plague Inc before.

Plague inc free to play guide