Pandemic: On the Brink is an expansion to our popular cooperative game, Pandemic, wherein players take on roles to work together to fnd cures to 4 diseases. In this expansion you will find six new roles (plus 1 revised OpEx and a Bio-Terroritst), 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: pits one player against the others! You may also play with 5 players and play on Legendary level! Other components include: 12 purple disease cubes, 12 pawns in a smaller size, petri dishes to store your diseases and pawns, a bio-terrorist pad for that player to record his actions. 2-5 players, age 10+, 45-75 minutes. This is an expansion, not a stand-alone game.