-you have to rescue every tribal before you can fight the last boss
this game is really fun. there is a big single player mode and you and a fried can play the single player once you get floyd. floyd is a robot that flys along side you, and a friend can take control of his guns to help you.the graphics are great and the sounds are good. there are lots of different quest and thing that you can do. there are tons of weapons and each character has there own special ability.
you should rent before you buy as you might not like it.