om me and my friend love this game and we only compleeted it with 1 life till we lose and we did it enough about me and about u. we get the best wepons and when you go down to where the boss is you have to kill a certain amout before he comes about well me and my friend do this who ever is the best wall hiding person goes down the boyyom where the wall is and hides and the other with the sniper hides up the top and trys to kill the bazooker men if not you both can hide down the bottom and kill anyone who trys to come and get you until the boss comes out. now this is trickey part if one of you guys has the rocket launcher you run out and try and kill him and distract him with is while running around him and the other goes up to the top where the rocket thingy is and starts to shoots him and dont stop till it is destroyed. if it is before hes dead then you both spend all your bullets on him down stairs or one down and one up ok thats all we do ok hope that helped you c ya.