How do I progress in the game?

The EggSpark has crashed onto Piggy Island, and the birds’ eggs have been transformed into crazed EggBots. They are blasting everything in sight and turning everything on Piggy Island into a hostile robot! It is your duty to rid Piggy Island of the havoking EggBots. To make progress, play through the points on the Piggy Island map that have been mechanized. You can see the EggBots blasting away on the map screen, but don’t attack them yet! You must first build up your team by rescuing new characters. Also, find new areas by clearing the fog that shrouds the island.