

Notice that on co-op, when one of you is further ahead then the other player, the lagging player is warped ahead. Instead, exploit the co-op system to your advantage. The moment you or your partner gets close to the last generator, the flood will kill you. When you are going back through the "Attack On The Control Room" stage, your objective is to destroy all the generators. Look to the right and you will find the name Rex written in blood.

There are two hall ways and go in the one with blood in it. Jump on top of the warthog and jump on top of the wall on either side (the one closest to you) and follow it up to an upper, smaller bridge. On the last level the Maw, on the last checkpoint, when you go off the big jump onto the small bridge,drive the warthog so a quarter of it is off the bridge. If you look up you will see 3 sniper spots a bottom, middle, and top go to the middle one with the banshee land carefully and go to the right side and look at the blue light wait a while and you will hear a hidden track. In assault on the control room near the end of the level on the rock road there will be a banshee steal the banshee and look behind you. Then jump on top of the ledge and kill your partner to pop them up next to you.

Get high as you can in the tree, then keep killing your partner and turning until they re-spawn on top of your head. Have your partner jump on the big boulder then jump on your partners head and on to the tree. Go to the upper left side to the single tree that is between a big boulder and a little boulder. Play on co-op, go to the gravity lift, kill all aliens, when you are done don't go onto the gravity lift. How to Reach the Top of Truth and Reconciliation Head towards the center and out of the fog you'll see a lone marine standing there! He won't move or say anything, unless you shoot him in the foot with your pistol. Now walk directly away from the ship until you reach a clearing. It flies for about 20 seconds then crashes. Whatever you do, DON'T MOVE! After a few seconds, the drop ship will take back off, and you'll still be in it. That was over twelve hours ago.” immediately start pressing your grenade throw button. When Foe Hammer says “The Last transmission from the captain's drop ship was from this area. Keyes in the swamp, there is a secret area you can access right from the beginning.
