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- Airfield: Nazi zombie building
Go to the multiplayer map "Airfield". Go to the first side, which is the one where you spawn behind the big building then go out to the field. Instead, go inside the building and examine it. Look around at the pillars and windows, then go upstairs to the left. Look around some more and on the balcony. Notice it is the same building in the Nacht Der Untoten (zombie) mission, except all the entrances are walled up or blocked by an invisible wall.
- Airfield: Sniping location
In the middle of the map there is a two story concrete building. Place satchels or Bouncing Bettys to protect your location. There is also a large white estate with a ladder and staircase in front of it that can be used as a sniping location.
- Asylum: Ghostly piano record
Above the bathroom in an invisible room, a piano can clearly be heard being played on a record player. The piano can only be heard if you music setting in the options menu is on.
- Asylum: Strange sounds
You can also hear a disembodied voice near the bathroom. It comes from just outside of the bathroom, and is best heard in Spectator mode.
Just outside of the bathroom on Asylum, exactly where the disembodied voice is heard, you can also hear a crying girl. She will switch back and forth from crying to laughing, and just like the voice, is quite disturbing.
All around the stairs that are a bit away from where the piano can be heard, you can here knocking on the wood that is covering up all the windows. If you fly around constantly as a spectator, you will hear this wooden knocking sound everywhere. It distinctly sounds like someone deliberately knocking on wood. It can also be heard on the boarded up windows on the other side of the map.
- Blood And Iron: Destroying other tanks
Use the following trick to destroy the other tanks faster and slightly easier. Shoot the tanks in the treads. This will destroy them in two shots about 90% of the time, rather than an average of four shots. When shooting at the tanks, it may help to move from side to side. Those tanks do not have the best aim, depending on the difficulty setting. If you wait just a moment after you shoot before you shoot again to slightly increase your accuracy.
- Bonus Weapons
Complete the indicated task to unlock the corresponding weapon bonuses.
Bolt Action Rifles
Springfield: Reach level 4.
Sniper Scope: Already available.
Bayonet: Complete Marksman Challenge 1
Rifle Grenade: Complete Marksman Challenge 2.
Arisaka: Reach level 4.
Sniper Scope: Complete Marksman Challenge 1.
Bayonet: Complete Marksman Challenge 2.
Rifle Grenade: Complete Marksman Challenge 3.
Mosin-Nagant: Reach level 21.
Kar98k: Reach level 41.
PTRS-41: Reach level 57.
Rifles
SVT-40: Reach level 4.
Flash Hider: Complete Marksman Challenge 1.
Aperture Sight: Complete Marksman Challenge 2.
Telescopic Sight: Complete Marksman Challenge 3.
Gewehr 43: Reach level 7.
Suppressor: Complete Marksman Challenge 1.
Aperture Sight: Complete Marksman Challenge 2.
Telescopic Sight: Complete Marksman Challenge 3.
Rifle Grenade: Complete Marksman Challenge 4.
M1 Garand: Reach level 17.
STG-44: Reach level 37.
M1A1 Carbine Reach level 65.
Sub Machine Guns
Thompson: Reach level 4.
Suppressor: Complete Marksman Challenge 1.
Aperture Sight: Complete Marksman Challenge 2.
Round Drum: Complete Marksman Challenge 3.
MP40: Reach level 10
Suppressor: Complete Marksman Challenge 1.
Aperture Sight: Complete Marksman Challenge 2.
Dual Magazine: Complete Marksman Challenge 3.
Type 100: Reach level 25.
Ppsh: Reach level 41.
Shotguns
M1897 Trench Gun: Reach level 4.
Grip: Complete Marksman Challenge 1.
Bayonet: Complete Marksman Challenge 2.
Double Barreled Shotgun: Reach level 29.
Machine Guns
Type 99: Reach level 4.
Bipod: Complete Marksman Challenge 1.
Bayonet: Complete Marksman Challenge 2.
BAR: Reach level 4.
Bipod: Complete Marksman Challenge 1.
DP-28: Reach level 13.
MG 42: Reach level 33.
FG 42: Reach level 45.
Browning M1919: Reach level 61.
Pistols
Colt M1911: Reach level 4.
Nambu: Reach level 4.
Walther P38: Reach level 4.
Tokrev TT-33: Reach level 21.
.357 Magnum: Reach level 49.
Primary Grenades
Frag: Reach level 4.
N 74 ST: Reach level 4.
Molotov Cocktail: Reach level 10
Special Grenades
Smoke: Reach level 4.
Tabun Gas: Reach level 4.
Signal Flare: Reach level 4.
- Castle: Get under level
Go directly to the wall by Target A in Search And Destroy mode. Find the blood stain. Sprint in and out of that corner repeatedly until you fall through. Duck down and crawl through the gap and you will now be under the level. From here you can kill people but they cannot get you. Note: You cannot throw grenades through to the level. If you want to get out of the whole level instead of just go under it, walk backwards towards the wall on your right. You will pass through. Do not go too far or you die. From here you can see through nearly all walls and kill people without being seen.
- Castle: Sniping location
There are many good sniping positions on this map. The first is a small room overlooking the garden and the front staircase. To get to this room either climb the ladder or go up the stairs. The second location is a small room that has a clear line of sight into the room mentioned above. To get to this room, go to the bottom of the map and climb up the staircase. You should be on a wooden porch that connects to the gardens. Turn left and you will be in the room.