In the double cross level you have to go to the bunker with the bald guy. When you get there, go over to the TV/Computer, press the action button(x),it will show you either the kitchen or this other area were there is a ladder, the kitchen will look empty, but once you get there, there will be 3 people, 2 people protecting the guy with the hostage, when you get there dont worry about the 2 guys protecting the other guy, kill the guy with the hostage or else he will kill the hostage and you will have to start over. the other 2 hostages are pretty easy to find. 1 of the halls you walk down you will see a girl screaming and running away from a room, go to that room and do the same thing- kill the guy with the hostage. the last one is where th dragon is. it is pretty hard to frree this hostage. (IM WARNING YOU DO NOT USE THE GRENADES) they will blind you.