Easter Eggs are hidden surprises throughout the Call of Duty series. They are most prominent in Zombie Modes, in the games developed by Treyarch. Some are easy and can be achieved alone, while others require a great deal of cooperation. Many of them, the most elaborate, can be used to gain an advantage either in a singleplayer campaign or multiplayer zombies game, and some unlock achievements. Every Nazi Zombies map has a secret song which plays after activating a number of objects.
Note that map or level features that are distinctive or interesting, like the Porter Justice posters in the Modern Warfare games, the ghosts in the Zombie Mode maps of Call of Duty: World at War, or the Brady Bunch house on Nuketown, are not noted here and can be found in the trivia pages of each map or level.
- Nacht der Untoten: A radio which plays different songs.
- Der Riese: Various easter eggs: This map contains a lot of different hidden surprises, including radio messages, the hidden song Beauty of Annihilation, and a game of hide and seek which unlocks an achievement.
- No Russian: In the mission there are two cases which appears to be Modern Warfare 2 on the front and Modern Warfare on the back, it can be spotted on the back of the case as the player walks up the escalators or stairs to a store on the left
- S.S.D.D.: If using noclip console command, it is possible to see that one of Rangers that is sitting near several M16A4's at the start of the level has dog tags. On them, it is possible to see written
- "WE MAKE WAR THAT WE MAY LIVE IN PEACE"
- — Aristotle.
It is part of the quote "And happiness is thought to depend on leisure; for we are busy that we may have leisure, and make war that we may live in peace."
- Teddy Bears: Various Teddy Bears are hidden throughout the single and multiplayer modes.
Call of Duty: Black Ops (Consoles)Edit
- CIA Data System: A computer accessible from the main menu room allows you to browse the contents of a CIA computer and enter various cheat codes. This allows you to access Dreamland and play Zork, which unlocks an achievement.
- Numbers: Thundergun: Use a Thundergun in the campaign, simply on the first part destroy all Nova 6 barrels with a grenade or gun, there should be six of them, then go to the room on the right and find the open tape dock. Hold square or X (it won't notify you) and continue to escape. When you reach the room with the wall of weapons, find the open tape dock, hold square or X again, it will close. If you did this right after a few seconds the screen should shake. Wait a few more seconds and hold square or X once again, you should now have obtained the Thundergun.
- Nuketown: Hidden song: If the heads of the mannequins are decapitated within 15 seconds, "Sympathy for the Devil" by The Rolling Stones is played. Requires multiple players to achieve. This may be hard, as the mannequins are randomly placed on the map every round, some might even spawn outside the map itself.
- The names on the mailboxes are the names of the protagonists in the campaign, Mason, Hudson and Woods. They will also have other names on them, which may be of some of the developers.
- The "Welcome to Nuketown" sign will change population according to how many players are currently in the game.
- Convoy: In the building on the top right of the map, there's a cargo transport board showing the names of all the maps in the game, including the First Strike and Escalation packs.
- There are "Wanted" posters all over the map of a boy named Raffaele Angelini at the age of 14. It says that he's wanted for "pwning noobs". It also says that his occupations are "Pwning noobs and being awesome" and that he's a very good Call of Duty player. Further down it says that he's very loved by the developers at Treyarch and Activision Blizzard. According to the description, he may be the son of one of the developers.
- In the police station, posters can be found that says "Men with long hippie hair will be attended to last". Under it says that long hippie hair is: "Hair touching the eyebrows" or "Hair falling across the forehead" or "Hair covering the ears" or "Hair reaching below an ordinary shirt collar". There are also picture illustrating these.
- In the lower left house there's a rack of magazines named "Exposed", which on the front page says "Russians launch first primate into space, and it returns a... WHAT THE HELL IS THIS?" with a picture of one of the Space Monkeys from Ascension on it.
- Note that the Zombies Mode easter eggs from World at War are also found in the Black Ops remakes.
- Undone (hidden song): Plays after shooting several barrels outside.
- Hidden song plays when you shoot the radio near the Mystery Box in the Help Room.
- Lullaby of a Deadman (Hidden song) Activated when one of the toilets are flushed 3 times.
- Radio: A radio which explains information about 115.
- The One - Talking on the telephone in the hut via Comm Room Section.
- 115 (hidden song): Plays a song when 3 pieces of meteor are activated.
- Film Reels/Radios: 3 film reels can be found and played on the projector, and 3 radios (one of which has not been found) can be activated to play recorded messages.
- Telephones: Plays Eminem's "Won't Back Down" when all three red phones are activated. (Note if you have GCF enabled you will not be able to listen to this song due to lots of strong language. Instead it will be replaced with constantly repeating music from the zombies main menu)
- The hidden zombie game mode itself, Dead Ops Arcade, is unlocked by entering "DOA"(Or 3ARC UNLOCK but this unlocks all the campaign and zombie maps) in the CIA Data System.
- Casimir Mechanism: Long easter egg requiring four players and Wonder Weapons; gives everyone a Death Machine for 90 seconds.
- Abracadavre (hidden song). Plays after three teddies holding sickles are activated.
- Character Dolls: Matryoshka dolls can be found that look like the original Nazi Zombies characters, which also talk.
- There are several telephones across the map that will sometimes ring. When answered, character quotes from "Five" can be heard.
- Original Characters Trapped: A long easter egg which sends the usual Zombies characters to "Paradise". Unlocks an achievement for performing this both in solo and multiplayer.
- Not Ready to Die (hidden song): Hidden song by Avenged Sevenfold.
- Radios: Play messages recorded by Richtofen.
- Pareidolia (hidden song): Plays a song when 3 pieces of meteor are activated.
- Coming Home (hidden song): Plays a song when 3 Teddy Bears are activated.
- Re-Damned: Hidden song which is activated by pressing the "use" button on a computer next to the Bio-Dome's door.
- 8-bit Pareidolia: Hidden song which is activated by obtaining a disc and using it on a computer in the bottom floor of the labs.
- 8-bit Coming Home: Hidden song which is activated by obtaining a disc and using it on a computer in Tunnel 6.
- Nightmare (hidden song): Activated by having somebody die when an Excavator is down, and then finishing the round, resulting in them spawning on the other side.
- Richtofen's Grand Scheme: A long easter egg which consists of two parts, which must be completed in the following order:
- Cryogenic Slumber Party: An easter egg where it requires the player to complete a number of steps to release Sam from the Pyramid, when the pyramid opens, all players will be granted a Death Machine for 90 seconds.
- Big Bang Theory: An easter egg which requires the players to complete a number of steps to launch three rockets to Earth. After they hit Earth, all players are granted with permanent eight perks.
Call of Duty: Black Ops (DS)Edit
- Snowman room: Contains the Crossbow. Using it unlocks the weapon for multiplayer
Call of Duty: Modern Warfare 3Edit
- Teddy Bear: In the multiplayer map "Lockdown" there is a building not far outside the map on the right of 3 hanging bodies; the rightmost window on this building can be flown through if using a Recon Drone or if the player is in Spectator, inside is an over sized Teddy Bear wielding Akimbo Gold Desert Eagles that use the Call of Duty 4 model.
- Arkaden Teddy Bear: In the map Arkaden, the food joint has a window the shows the "kitchen" it has many grills and a giant bear (much like the bear in lockdown but without the desert eagles).
- Porter: In the map Mission, there is writing above a teddy bear saying: "Porter wuz here", which is a reference to Jon Porter, who did art work for the Modern Warfare series.
- Wallstreet: In the Mission "Black Tuesday" when you reach the New York Stock Exchange there are TV-Screens on the Wall saying: IW, BLZ, SHG, WAR, ATVI and TREY these are References to Infinity Ward, Raven Software, Activision, Treyarch, Sledgehammer Games and Blizzard.
- Train directions: When coming out of the tunnel with the wrecked train on Mind The Gap, there is a map of train directions with referencing names such as 'Black Cat Way', 'Verrückt', 'Infinity Station Ward', etc. And with weird names as well such as 'random place', 'no ammo road' etc. Also, this map is behind one of the original spawn points on Underground, the one that faces the actual subway station.
- Carbon: On phones in this map, there is inscription - COD4
- Shepherd: In the Special Ops mission Stay Sharp, after getting to Sandman, turn to your right without shooting any cutouts. You will see a picture of Shepherd with three throwing knives in it. One knife is in his eye; a reference to how he was killed in Modern Warfare 2.
- Ghost Voices: In the map Sanctuary, if the player goes to any of the four grassy patches near the middle of the map, he can hear ghostly voices saying "Hehe, look at me, daddy! Hehe!", "Don't get too close to the road, sweetie", "Hehehehehe.", and "Sarah, don't go too far!" The voices are sound clips taken from Davis Family Vacation.
- Village: Outside the map on the east corner, there is a partially revealed hatch with the numbers "4 8 15 16 23 42" engraved on the window, an reference to the hatch in the TV series "Lost".
- Stay Sharp: In the Special Ops mission Stay Sharp, when you spawn, turn back and go to the Jeep. In the trunk of the car there will be an AK-74u on top of a gun case, and in the driver seat there will also be a USP .45. Though the AK-47u gives you an advantage in the course, the USP .45 that you pick from the jeep comes without a Tactical Knife, unlike the default one that comes in the mission.
Call of Duty: Black Ops IIEdit
- When getting the gift in Section's room in the mission "Odysseus", If you look to the right when going through the door, there will be some sticky notes attached to the cupboard. One of them reads "Zombies are Coming". This sticky note is also seen in many multiplayer maps.
- If all mannequin heads are shot off in at least 1 minute and 30 seconds on Nuketown 2025, classic Atari games can be played on the screen in the center of the map.
- Outside the multiplayer map of Nuketown there are flags with Spetznaz and Black Ops call signs on them, referring to factions of Call of Duty: Black Ops.
- In the tunnel there is a green sign hanging from the roof with all but a few letters blacked out. The remaining letters spell "Day x over 2 me".
- In the Diner area the signs letters that are lit spell "Now Die" and "On For You".
- Holding down the action button on the three Teddy Bears will activate Carrion.
- Teddy Bear one is found outside in Bus Depot sitting on a bench near the mini lava pit.
- Teddy Bear two is found in the Farm area. It is laying on a mat on the second floor of the house where one can build the Turret.
- Teddy Bear three is found in Town in the bar on the first floor. After entering through the big entrance turn right and look at the booths.
- Holding down the action button on the three Teddy Bears will activate We All Fall Down.
- Teddy Bear one is on the floor below the spawn room next to the SVU-AS.
- Teddy Bear two is in the upturned restaurant (Buddha room) on the edge of the floor.
- Teddy Bear three is in the power room above a sewing machine.
- If the player looks at the fireworks with a sniper rifle on the prison's roof, a flash of a creepy face (resembling Russman) along with a high-pitched scream will appear.
- Inputting the number 935 in the number pad will activate Where Are We Going.
- Activate three beer bottles & the song "Rusty Cage" will play.
- Bottle one is in the library, on the bookshelf next to the Olympia.
- Bottle two is found in the infirmary near the roof, resting on a desk across from the blood baths.
- Bottle three is found at the far left side of the gate at the docks, hidden underneath a wooden crate.
- Holding down the action button on the three Teddy Bears will activate Always Running.
- Teddy Bear one is next to a hay bale by Quick Revive.
- Teddy Bear two can be found in a barrel in the candy shop.
- Teddy Bear three be found in the mansion in the room with Double Tap.
- Holding down the action button on the three green meteorite fragments will activate Archangel.
- In the spawn room right of the ancient chest on the other side of the bunk bed.
- On the second floor of the work station opposite the stairway under a bed.
- On the scaffolding left of the entrance to the Excavation Site entrance facing spawn area next to a crate.
- Holding down the action button on the three radios will activate "Shepherd of Fire".
- Going prone on the number panels on Generator 1 and Generator 5 (the latter must be powered) will active "Aether".
- If the player goes to the Pack-A-Punch and scopes in to the top right of the Church, a screamer will pop up. This is a possible refrence to Mob of The Dead since both maps were made by the campaign team.
- In Extinction, If the letters "LOL" are shot in order with any weapon (preferably a Sniper Rifle) on the Gil's Lodge Motel sign, the phrase will appear across the screen in bright blue and purple text. Every alien the player then kills for ninety seconds will explode into a pile of golden alien plush toys similar to those seen in the upstairs room of Nuketown 2025 in Call of Duty: Black Ops II.
- In the maps Sovreign, Stormfront, Flooded, Seige and Freight, a teddy bear can be found. In Flooded, go to the half sunken bus in the river. On the side that is mostly out of the water there is a pipe going up one of the buildings. You can climb this pipe and find a teddy bear wedged between the pipe and the building. In Stromfront, the teddy bear can be found in the "O" on the Superty Union logo on the skyscraper holding a bottle of alcohol. The teddy bear in Seige is found nailed to the inside of a pipe in the middle of the map. In Sovreign, a teddy bear is found inside an office wearing a hardhat. The last teddy bear is found outside the map on frieght.
- In the single player mission "Struck Down" you can find a trophy case witha few easter eggs in it. One trophy is in the shape of gem saying "Award for most bushes cut and pots smashed" referancing The Ledgend of Zelda. Another says "Award for largest interior and smallest exterior" referancing Doctor Who. Lastly, the is an award saying "Given For: World Not Ending". This is a referance to the end of the mayan calender
- In the same room outside of Freight with the teddy bear, a stop sign, a hammer and a clock is laid on the floor. This is a referance to "Stop, Hammer Time"