Pandemic On the Brink Expansion

Pandemic: On the Brink is an expansion to our popular cooperative game, Pandemic, where players take on roles to work together to find cures to 4 diseases.
In this expansion you will find seven new roles; eight new special events; and several challenge kits to be added to the basic game play.
Virulent Strain Challenge: makes one disease become particularly deadly in unpredictable ways.
Mutation Challenge: adds a fifth (purple) disease that behaves differently than the original four.
Bio-Terrorist Challenge: one player plays against the others!
You may also play with 5 players and play on Legendary level!