Call of Duty: Black Ops 6revives the classic round-based zombies mode, offering players a familiar and thrilling undead survival experience. This mode retains the essence of the franchise, delivering everything fans love about fending off hordes of zombies. As with previous games, each map is packed with hidden secrets and mysteries waiting to be uncovered.

A fan-favorite secret has always been the unlockable hidden songs. Both prior maps featured them, and Citadelle Des Morts continues this tradition. To activate its secret track, you’ll need to locate three Mr. Peeks headsets scattered throughout the map, just like in previous installments.

First Headset Location

After spawning in Citadelle des Morts, lookto the left to find a tavern entrancenext to the GobbleGum machine.

Head inside andto the right,on the second table, you’ll findthe first setof Mr. Peeks headsets.

Second Headset Location

Progress forward andfollow the path to the rightto make your way to the castle.

After reaching the Speed Cola machine, take the stairs up, exit through the gate, andhead to your right.In the corner, you’ll find the second headset you need.

Third Headset Location

For the last headset, head inside the castle andmake your way to the underground level.

Locate the watery room, where you’ll finda red couch. Just on the floor near it, you’ll spot thefinal headset.

Once you’ve found and interacted with all three headsets,the secret Citadelle des Morts song will play. We won’t spoil the surprise—experience it for yourself!

How To Unlock The Second Secret Song On Citadelle Des Morts

Just recently, we discovered that you’re able to actually activate a second secret song on Citadelle des Morts. However, this time,you first need to obtain the fire sword Caliburn.

After you get your hands on this sword, make your way back to thethree braziersfrom which you took the fire, andhit them with the sword to light them back up.

Once you do this to all three braziers,the second secret song of the map will start playing.