Call of Duty 4: Modern Warfare

It is possible to get on the roof of the center building (also the one with a garage - it has a car in it) in Backlot. Go to the second floor and go up to the wind facing away from where 'Flag B' would be if you were play Domination. Get it to saw "A to |-> (where you can like go on top" So now you should be standing in the window sill. While crouching slowly walk out and look toward the left. You will see a balcony. Jump and hit A twice so you can again activate the "A to |->" while in midair. You will be in the balcony and there will be a ladder leading to the roof. Climb up and you can see practically the whole map. However, there is minimal cover so don't stand straight up, try going prone and after getting some kills go to the middle of the roof and regroup.

Bog
On the side where you spawn for offense in search and destroy, if you go around the wall that is on your left as you spawn, there will be a dumpster on fire. Before the dumpster, the ground has a tiny lump (hill) in it. If you sprint towards the lump in the ground and jump at the top of it, you can get on top of that dumpster and go prone and snipe. Enemies cant really see you while you are here because you are surrounded by fire.

Downpour
Go to the area where those two steel canister tower things are, and go to the side OPPOSITE the hole you can crawl through (by the hedges). Face the hedges. On the left should be the edge of the map and there is a concrete wall. If you walk against the concrete wall and all the way against the hedges, you should go inside this big patch of weeds. If you turn around you can keep your sights on the hole and kill everybody who tries to go through it. You cannot be seen from this spot. From any direction. AT ALL.

Bloc
In one of the buildings there is that one room where it is like glowing red and all of the trash and debris makes a hill from the first floor to the second floor. There are things on fire on both sides of this hill. At the bottom (first floor side of the room) there is a little steel barrel on fire. You can go behind that and go prone with an SMG and kill everybody who goes through that room. You can only be seen if somebody sits there staring at you for a while.

For the last two spots, even if your position is given away to your enemies from your kill-cam, it doesnt really make a difference because they cant see you in the first place so if they go to look for you in your spot they can't see you at all so they dont even know if your still there.

Complete the following achievements to unlock Xbox Live Gamerscore points.

There are two places in the "All Ghillied Up" mission where you can face an army of enemies or practice your shooting skills. Wait until you have passed the convoy with the tanks and the troops. You will see the two guards throwing the dead bodies in the water. Shoot one of them in the leg and he will alert the rest. The entire the convoy will then come at you. The other location is at the fire escape. Go up to the floor of the fire escape without shooting the sniper. Get a G36C from the top room and a Stinger. Shoot down the helicopter to get an enemy army after you.

During the "All Ghillied Up" mission, you will come across a wild dog eating a dead soldier's remains. You will be told to leave it alone, but if you want probably the most difficult challenge in the game, shoot it. You will be attacked by a large pack of angry dogs.

In the mission when you play Cpt. Price, you will encounter a wild dog eating a man. You are told to leave it alone, but if you kill it you will hear dogs growling. You are then attacked by a large pack of them. This is the best way to practice your dog killing skills, but be warned. You must save your comrade, because if he dies you must start over again.

Note: This requires two players. When playing on the OpFor/Spetznas side, as soon as you spawn go left into the little area behind the yellow station wagon. Have one person keep jumping into the corner and the other crawl under them. When the person is completely under the other, crouch and then stand (not at the same time but one after the other). The other person should have jumped over the wall and be out of bounds.

When playing the Marine's side (wooden shacks and the field), in the back building with the turret there is a dumpster besides it, against a ground window. Crouch and sit inside the building behind the dumpster. You can snipe out of the window down the side alley. Also in the back building, go up the stairs and turn left. There is a table beside the stairs. Climb onto the table then onto the railing (banister). This may take a few attempts. Jump across the stairs onto the gray ledge with the fencing. From here you can snipe the entrance to the field and the big concrete building on your side.

When playing on the OpFor/Spetznas side (the destroyed concrete buildings), as soon as you start go straight to the hole in the ground. Directly in front of it should be two roadblocks. Go prone (lie down) and look between them. From here you can snipe across the street to the opposite concrete building (helicopters can see you).

When playing on the OpFor/Spetznas side, go down the street and up the stairs on the left. There is a sheet metal ledge that you can stand on. Stand on the edge of the sheet metal and look to the left (back to your spawn point). You can see an opening in the side of the building. Sprint jump off the end into the side of the building. This may require a few attempts.

To unlock Arcade Mode, beat the game once through on any difficulty level. Arcade Mode itself is split into two options - Full Challenge or Level Challenge - that add extra replayability to the game.

On the Marines side of "Flag B" is sheet metal guarding the top of a building. Climb the ladder to get to the top. To stand on the sheet metal itself, climb onto a ledge and slowly go back and forth until you see the "Climb" option. Make your way to the ledge besides the building overlooking the tiny enclosure. You will see a white radiator. Jump into it. There are little knobs sticking out of the buildings that look like this.
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Radiator>[l] l l l l

Once you get the Red Dot Scope addon to your weapons, use it over the ACOG scope. The red dot will not enhance or take away anything and provides a better aimpoint on most weapons. The ACOG scope will actually add more range to your weapon, but take away accuracy which accomplishes almost nothing; especially so for snipers because it takes away range and adds nothing.