Chamber of Repetition

Chamber of Repetition is a secondary easter egg in the Call of Duty: Black Ops II Zombies map Theoretical. When it is completed, the player is awarded the "Headhunter" secret achievement and the will be added to the Mystery Box for all players in the game, and will stay through consecutive plays.

Prerequisites

 * Turn on all the Generators
 * A player must have the Molotov Cocktails.

Step 1
The players must travel to the top of Call of the Dead's lighthouse and shoot the moon. If done correctly, a sound clip will play, and Arthur Arlington will talk about Maxis' plan.

Step 2
The players must travel to the Stamin-Up machine in Ascension, and once again shoot the moon. This time, a recording of Harvey Yena will play and talk about how Maxis seems different.

Step 3
Lastly, the players must travel to the Moon and shoot the full Earth. If done correctly, quotes from the easter egg will play, and the Earth in space will explode. The player will then say their own rendition Tank Dempsey's quote from after the easter egg is completed ("Uh, that's it? Seriously? All that work and all we did was blow up the Earth? What the fuck..."). If Tank Dempsey is in the game, he will just mumble that Treyarch is getting unoriginal now.

Step 4
The players must travel to the Mystery Box and throw a Molotov Cocktail all over it. A Hell's Retriever will raise out of the box, and all players can grab it. Once all players grab it, Samantha's laugh will be heard (but she will say that it wasn't her) and it will drop back into the box.

The players will now get the Headhunter achievement and the Hell's Retriever will be able to be grabbed from the box in any future playthroughs. The song "" by Avenged Sevenfold will play after the Hell's Retriever falls back into the box.