The Expansion Pack is the access to a major part of the game's future storyline, and just other maps as well. It costs 5000 MM after completing the Campaign mode. Almost all of the bloons have the Liberated property, which gives each layer x2 health (Ceramics will be a pain), and have a black sun printed on it (white on Black Bloons). When on blimps, adds half of the original health to the current to make the Liberated health. Ex: 200/2= 100(+200)= 300 Liberated M.O.A.B health.