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Press Back then press A, X, B, Y, A during game play. A message will confirm correct code entry.

Successfully complete all fifty dossier missions. The following codes can now be enabled.

In the multi-player day Castle level, go to the house near the broken fence. Go to the right side of the door and crawl into the corner between what appears to be a trash can or box as far as you can. Then, stand up and you can shoot out. If an enemy enters the house, they can see and shoot you but you cannot do the same. The only way out is to go through the door.

Go to the house on the southwest side of the map. Lay down on the porch and you will notice a cylinder. Get close enough to it and you will see a shaded triangle. Try crawling between the triangle and the cylinder, and you will notice that the walls have disappeared. Stand up or kneel, and you can shoot people. Note: If someone comes in the house they will be able to see you.
Jameson Fehlhaber.

In the day Docks level in Xbox Live!, have a pair of binoculars out and go near a box. Lay down and start to crawl into it. This will only work on the small metal boxes with the wood frames at the bottom. The enemy will still be able to shoot the box and kill you. Sometimes if you do not do this correctly, your feet will stick out of the box, making you an easy target.

If you have binoculars, go in front of the metal box in between the office and the other building. Make sure there are two boxes behind you. Lay down flat and take out your binoculars. Start crawling forward to get in the box.
Jameson Fehlhaber.

In the day Docks level, go to the crater in the corner of the map. Go to the next one over and you will see a rock near some boxes. Take out binoculars and lay down on your stomach in front of the rock (not in the gap). You should lay down directly in front of the largest smooth area. Then, with your binoculars still out, start crawling forward. If done correctly, you will notice that the rock has disappeared, because you are inside it. You can stand up and walk around. If you move forward, you will notice some boxes to your left. You can easily walk in them and shoot people from there, but be careful not to go too far out; you might walk out of the boxes and get shot.